定语从句精讲以及五十题由刀豆文库小编整理，希望给你工作、学习、生活带来方便，猜你可能喜欢“定语从句专项练习50题”。
定语从句 【知识简介】
名词或代词由一个从句来修饰，该从句即定语从句。定语从句一般后置，但as引导的修饰全句的定语从句可以前置。
引导定语从句的词有关系代词that, which, who, whom, whose, as等以及关系副词when, where, why等。关系代词或关系副词放在被修饰的名词或代词（又叫做先行词）和定语从句之间起联系作用，同时又作定语从句中的一个成份。【要点难点】
1)that和which的用法区别 只用that的情况：
① 先行词由最高级修饰时，如the best work that I can do。② 先行词由序数词修饰时，如the second book that I bought。③ 先行词由the last, the only, the same, the very等修饰时。
④ 先行词是不定代词all, anything, everything, little, much, nobody, nothing等时，如anything that he does;all that I can do now等。
⑤ 先行词有any, no, all等限定词时，如all the words that I've learned。
⑥ 先行词为词组，该词组既含人又含物时，如the city and the people that I visited。只用which的情况：
① 在非限定性定语从句中（定语从句前有逗号）。The house, which we bought last month, is very nice.这幢房子很漂亮，是我们上个月买的。（非限制性）② 介词后。Beijing is the place where（in which）I was born.请看that和which的使用例句：
? It's the best film that's ever been made on the subject of madne.这是以精神病为题材而拍摄的影片中最好的一段。
? Shakespeare is the greatest poet that England has ever had.莎士比亚是英国最伟大的诗人。（本句中先行词虽是人，但由于前面也有形容词最高级修饰，仍用that较好）? Take the first opportunity that offers.抓住第一个出现的机会。
? He is the last person that one would suspect.人们最不可能怀疑他。
? Man is the only creature that is gifted with speech.只有人类具有语言的天赋。
? A fool sees not the same tree that a wise man sees.一个傻瓜看到的树和一个聪明人看到的树不一样。
? Those were the very words that he said at the meeting.这些就是他在会上说的原话。? All that glitters is not gold.闪光的并不都是金子。
? Anything that you have to say had better be said in each other's presence.有话最好当面说。? There's still much that is to be done.仍然有很多事要做。
? I have changed my mind.Nothing that you say will change it.我已经改变了主意，无论你说什么也无法改变它。
? Nobody that was there could convince her of her mistake.这那儿没有一个人能使她明白她的错误。
? Every paper that you read gives the same story.你看的每份报纸都报道同样的新闻。? I still can't forget the places and the people that I visited during last summer vacation.我仍然难以忘怀去年暑假我见到的地方和人。2)关系代词（that, which, who, whom等）和关系副词（when, where等）的用法区别 ① 关系代词在定语从句作主语、宾语或表语，而关系副词在定语从句中作状语。② 分析时主要从动词的及物性或有无介词来考虑。看如下对比例句：
① This is the factory where my father once worked.这是我父亲曾工作过的工厂。（worked是不及物动词，不接宾语，所以不用which/that。where相当于in the factory）This is the factory which/that my father once worked in.（worked in的宾语是factory，故用关系代词which/that）
② I will never forget the days which/that I spent in the wood near our village.我忘不了我在我村边小树林里度过的日子。（the days是spent的宾语）
I will never forget the days when I spent my holidays with my grandparents.我忘不了我和我的祖父母一起度假的日子。（spent的宾语是holidays，不是the days）
I will never forget the small village where I spent my holidays.我忘不了我度假的小村庄。（与上句一样，spent的宾语是my holidays）
③ Is this the school which/that you visited the other day? 这是你几天前参观过的学校吗？（the school作visited的宾语）
Is this the school where you visited your teacher the other day? 这是你几天前拜访你老师的学校吗？（visited在定语从句中有自己的宾语your teacher，所以不用that/which）3)those who和he who句型
两个常用句型。He who常用于谚语中。请看例句：
? He who doesn't reach the Great Wall is not a true man.不到长城非好汉。? God helps those who help themselves.上帝帮助自强的人。
? He who insists on seeing with perfect clearne before he decides never decides.坚持一切看清楚之后才做决定的人永远也做不了决定。
? He was a bold man who first ate an oyster.第一个吃牡蛎的人是勇敢的人。4)whose的用法
whose是关系限定词，既可以指人也可以指物，即既可以说“某人的”，也可以说“某物的”。? Fortune never helps the man whose courage fails.运气永远不会帮助丧失勇气的人。? That's the man whose house has burned down.那就是那位房屋烧毁的人。
? Have you noticed the house whose windows are closed now? 你注意到了那家窗户关着的房子吗？
? He's written a book whose name I have completely forgotten.他写了一本书，书名我完全忘记了。
? Above the trees are the mountains, whose magnificence the river faithfully reflects on the surface.在树林的高处是山，其壮丽的景色完全映照在河面上。
注：在正式文体中，指物时，whose往往用of which表示。of which可放在被修饰的名词之前或之后，而whose只能放在被修饰的名词之前。例如：The house whose windows/of which the windows/the windows of which are broken is unoccupied.（那间窗户破了的房屋没人居住。）whose前有时有介词。
? The teacher in whose cla my daughter is studying is a kindhearted man.我女儿所在的那位老师心地善良。
? Michel Croz, with whose help, Woolworth climbed to the mountain top, was one of the prefeional guides.米歇尔?克罗兹是职业向导之一，在他的帮助下伍德沃斯攀登到了山顶。? Then we had a chance to talk with that tall man, from whose accent we at once knew that he came from Hunan Province.后来我们有机会和那个高个子说话，我们从他的口音迅速知道他是个湖南人。
5)限制性定语从句和非限制性定语从句的区别
限制性定语从句和非限制性定语从句的区别：限制性定语从句是先行词（即被修饰词）不可缺少的定语，限制性定语从句前不用逗号隔开；非限制性定语从句只是对先行词的附加说明，如果去掉，先行词所述对象仍很清楚，非限制性定语从句前常用逗号隔开。这里有两个例句及分析：
Those who want to go camping please tell the monitor.想去野营的人请告诉班长。（定语从句who want to go camping在句中不可少，否则先行词those不知道指谁，也就变得无意义，因此它是限制性定语从句。）
Football, which is a very interesting game, is played all over the world.足球风靡全世界，它是一项很有趣的运动。（定语从句which is a very interesting game只是对意义已很明确的football作一个补充说明，因此它是非限制性定语从句。）
注意，非限制性定语从句可以用关系代词which, who, whom, whose, as及介词+which/whom等引导，也可以用关系副词when, where引导，但不能用that引导。另外，非限制性定语从句中的关系代词或关系副词是不能省略的。6)whom的用法
只有作定语从句中的宾语时才能用whom；介词后用whom不用who。口语中whom前无介词时可用that或who代替。
? My brother, whom you met the other day, has gone abroad.前几天你遇见过的我的那个兄弟，出国去了。
? I have a few friends whom I could ring to see if they are free.我有几个朋友，我可以打电话去联系，看看他们是不是有时间。
? You have many people around you who are kind to you but whom you will soon forget.你周围有许多对你好的人，但你都会很快忘记他们。
? There came a lot of children, most of whom I didn't know.来了许多孩子，大多数我都不认识。
7)介词＋which/whom引导的定语从句
如果关系代词which/whom本身在定语从句中充当一个介词或介词短语的宾语的时候，有时可以将介词直接放在which/whom的前面，这样就产生了“介词＋关系代词”及“名词或代词＋介词＋which/whom”或“复合介词＋which/whom”等的结构。
? I know the man to whom you talked just now.我认识你刚才与之说话的那个人。? Life is a flower of which love is honey.人生是花朵，爱情是花蜜。
? He was educated at the local grammar school, after which he went on to Cambridge.当在当地的一所中学上学，此后就去上了剑桥大学。
? It's a family of five children, all of whom are studying music.这一家有五个孩子，他们都在学音乐。
? In the attic we found some apples, none of which was fit to eat.在阁楼里我们发现了一些苹果，其中没有一个能吃的。
? I have three brothers, all of whom have gone abroad.我有三个兄弟，他们都出国了。? Soon they spotted a mountain, on top of which stood a temple.不久他们发现了一座山，山顶上有一座庙宇。8)why引导的定语从句
关系副词why用在reason之后，只引导限制性定语从句，why在从句中作状语，表示原因。? Give me the reason why you should be interested in his affairs.告诉我你为什么竟对他的事这样感兴趣。
? The reason why she was ill was that she had eaten bad meat.她生病的原因是她吃了变质的肉。
? That is the reason why he raised the question.这就是他所以提出问题的原因。
注意：有时reason后不一定是why引导的定语从句。如下列句子中，reason后接的是which/that引导的定语从句，这是因为，reason在定语从句中作主语或宾语。
? Is this the reason which/that the chairman gave at the meeting? 这就是主席在会上所给的理由吗？
? I really can't understand the reason that/which he explained.我实在无法理解他所解释的理由。
9)where引导定语从句有时修饰一些具有抽象意义的表示地点的名词，如situation, point, position等等。
? If you are ever in a situation where someone starts shooting, drop to the ground.如果你遇到有人要射击的情况就摔倒在地上。
? But after a few days' stay they got to the point where they could read each other's thoughts.不过呆了几天之后，他们到了一个彼此能理解相互想法的阶段。
? It got to the point where I couldn't remember any of the reasons I loved him.到那时候，我无法记起我爱他的任何理由了。10)the way后的定语从句
The way后的定语从句用in which引导，in which可以用that代替，而that又可以省略。所以，表达“某人做某事的方法”有三种形式：1.the way in which somebody does something 2.the way that somebody does something 3.the way somebody does something.11)which指代前面的句中的内容
which的这一用法只能以非限定性定语从句出现。
? Jenny was late for school a third time during the week, which made her teacher very angry.詹妮一周内第三次迟到了，这使得她老师很生气。
? He left early, which was wise.他早早地离开，那是很明智的。
? He suddenly became wealthy, which changed his whole mode of life.他忽然变得富有了，这改变了他整个的生活方式。
? He often helps me with my leons, which is kind of him.他经常在功课方面帮助我，真是感谢他。
12)which作关系限定词的情况
which作为关系限定词时，其本身代替前面所陈述的内容。
? She asked me to see the doctor, which advice I took at once.她要我去看医生，我立即采纳了她的建议。
? He is studying economics, which knowledge is very important today.他正在攻读经济学，这门知识在今天是非常重要的。
? He believes in students' doing more homework, which idea I am quite opposed to.他相信要让学生做更多的家庭作业，我非常反对这个观点。
which的这种用法常伴随介词而用。常见的词组形式有by which means, during which time, in which case, for which mistake, for which reason等等。
? She may have mied the train, in which case(=if this happens)she won't arrive for another hour.她也许没赶上火车，如果那样的话，她一小时是到不了的。? I called him by the wrong name, for which mistake I apologize.我叫错了他的名字，为此我道歉。
? He didn't feel well that morning, for which reason he didn't attend school.那天早晨他感到不舒服，因此，他没去上学。
? Tom spent four years in college, during which time he learned French.汤姆在大学上了四年学，在这段时间里，他学会了法语。13)as用法
关系代词as引导定语从句有两种形式。（1）as引导一个非限制性定语从句修饰一个分句，as代表该分句所表达的整个概念或其中一部分的概念。as定语从句可置于句首、句中或句尾；as本身在从句中充当主语、宾语及表语。（2）用于as...as, the same...as, so...as, such...as等结构中。
as用法的第一种情况：
? As is known to all, the earth moves around the sun.众所周知，地球围绕太阳旋转。
? He must be an African, as may be seen from the colour of his skin.他准是个非洲人，这可以从他的肤色看得出来。
? If he comes late, as is usual, for another time, we'll not receive him.如果他再一次像以往那样迟到，我们就不接待他了。
? She is a fine singer, as her mother used to be.她是个很出色的歌唱家，像她的母亲当年一样。
? As you will find out, all is now settled.你会发现，现在一切都解决了。
? Helen is somewhat crazy, as everyone could see.海伦有些神经错乱，这种情况每个人都看得出。
注意这一类的as表面上看好像和which代替全句时的用法相似，但as引导的定语从句的最大特点是它的意思多侧重于表达“（正）像......、（正）如......”及类似的意思。一般说来，当关系代词在从句中作be动词的主语或一般动词的宾语时，which和as可交替使用；当关系代词在从句中作一般动词（非be动词）的主语时，只能用which；as可置于句首、句中，而which则不能。例如：
? He was late for school, as/which was usual with him.他上学迟到了，他经常这样。
? He saw the girl, as/which he had hoped(he would).他见到了那位姑娘姑娘，正像他希望的那样。
? He saw the girl, which delighted him.他见到了那位姑娘，这使得他很开心。（句中的which不能用as代替，因为从句中的delighted是非be动词）
? As has been said before, grammar is not a set of dead rules.正如上面所说的那样，语法不是一套死的规则。（句中的As不能用Which代替，因为此定语从句置于句首）as用法的第二种情况：
? There's as good fish in the sea as ever came out of it.海里有的是鱼；天涯处处有芳草。? Here is so big a stone as no man can lift.这是一块没人能搬动的大石头。
? Her manner and attitude toward him were quite the same as they had always been.她对他的举止和态度和往常是完全相同的。
? He does not poe such a mind as is neceary to a scientist.他缺乏科学家所必须具备的头脑。
? Such food as they gave us was scarcely fit to eat.他们给我们的食物很不适合吃。? A man such as he will surely succeed.像他这样的人是肯定会成功的。
? I haven't much money but you can use such as I have.我钱不多，可你能用我所有的钱。? Such as you see is all we have.你所见到的就是我们所有的东西。14)介词+whom/which + to do的类定语从句结构的不定式用法
? This is a useful tool with which to cut steel.这是可以用来切割钢材的工具。
? Can you recommend someone from whom to learn how to use the software? 你能推荐一个可以向他讨教使用这一软件的人吗？
? It's not a room in which to live comfortably.这不是可以舒适居住的房间。
这一结构的介词位置固定，不可移到动词之后，如第一句中的with which to cut steel不可改成which to cut stell with。15)嵌入式定语从句
有一种定语从句，在其从句中的主语和谓语之间有一个插入语如I think。这一种定语从句叫做嵌入式定语从句。嵌入的分句的谓语动词常常是think, believe, gue, imagine, say, suppose, be sure, doubt等等。
? She offered a suggestion which she said would interest you.她提出一个她说一定会引起你兴趣的建议。
? He wrote letters to every person and organization that he believed might be able to help.他写信给每个人和每个组织，他相信可能有帮助。
? That is the engineer who I think is the right man chosen for the job.那位就是我认为适合被选派做这项工作的工程师。
定语从句
1.The place _______interested me most was the Children's Palace.A.Which
B.where
C.what
D.in which 2.Do you know the man _______? A.whom I spoke
B.to who spoke
C.I spoke to
D.that I spoke 3.This is the hotel _______last month.A.which they stayed
B.at that they stayed C.where they stayed at
D.where they stayed 4.Do you know the year ______the Chinese Communist Party was founded? A.which
B.that
C.when
D.on which 5.That is the day ______I'll never forget.A.which
B.on which
C.in which
D.when 6.The factory ______we'll visit next week is not far from here.A.where
B.to which
C.which
D.in which 7.Great changes have taken place since then in the factory _______we are working.A.where
B.that
C.which
D.there 8.This is one of the best films _______.A.that have been shown this year
B.that have shown C.that has been shown this year
D.that you talked 9.Can you lend me the book ______the other day? A.about which you talked
B.which you talked C.about that you talked
D.that you talked 10.The pen ______he is writing is mine.A.with which
B.in which
C.on which
D.by which 11.They arrived at a farmhouse, in front of ______sat a small boy.A.whom B.who C.which D.that 12.The engineer ______my father works is about 50 years old.A.to whom
B.on whom
C.with which
D.with whom 13.It there anyone in your cla ______family is in the country? A.who
B.who's
C.which
D.whose 14.I'm interested in ______you have said.A.all that
B.all what
C.that
D.which 15.I want to use the same dictionary ______was used yesterday.A.which
B.who
C.what
D.as 16.He isn't such a man ______he used to be.A.who
B.whom
C.that
D.as 17.He is good at English, ______we all know.A.that
B.as
C.whom
D.what 18.Li Ming, ______to the concert enjoyed it very much.A.I went with
B.with whom I went
C.with who I went
D.I went with him 19.I don't like ______ as you read.A.the novels
B.the such novels
C.such novels
D.same novels 20.He talked a lot about things and persons ________they remembered in the school.A.which
B.that
C.whom
D.what 21.The letter is from my sister, ______is working in Beijing.A.which
B.that
C.whom
D.who 22.In our factory there are 2,000 workers, two thirds of ____are women.A.them
B.which
C.whom
D.who 23.You're the only person ______I've ever met ______could do it.A.who;/
B./;whom
C.whom;/
D./;who 24.I lost a book, ______I can't remember now.A.whose title
B.its title
C.the title of it
D.the title of that 25.Last summer we visited the West Lake, ______Hangzhou is famous in the world.A.for which
B.for that
C.in which
D.what 26.I have bought such a watch _______ was advertised on TV.A.that
B.which
C.as
D.it 27.I can never forget the day _______ we worked together and the day ______ we spent together.A.when;which
B.which;when
C.what;that
D.on which;when 28.The way ______he looks at problems is wrong.A.which
B.whose
C.what
D./ 29.This is the reason ______he didn't come to the meeting.A.in which
B.with which
C.that
D.for which 30.This machine, ______for many years, is still working perfectly.A.after which I have looked
B.which I have looked after C.that I have looked after
D.I have looked after 31.The reason ______he didn't come was ______he was ill.A.why;that
B.that;why
C.for that;that
D.for which;what 32.He is working hard, ______will make him pa the final exam.A.that
B.which
C.for which
D.who 33.That is not the way ______I do it.A./
B.which
C.for which
D.with which 34.I have two grammars, ______are of great use.A.all of which
B.either of which
C.both of that
D.both of which 35.I want to use the same tools _______used in your factory a few days ago.A.as was
B.which was
C.as were
D.which 36.My neighbours used to give me a hand in time of trouble, _______ was very kind of them.A.who
B.which
C.that
D.it 37.This is the magazine _______ I copied the paragraph.A.that
B.which
C.from that
D.from which 38.He is not such a man _______ would leave his work half done.A.that
B.which
C.who
D.as
39.You can depend on whatever promise _______ he makes.A./
B.why
C.when
D.whose
40.Smoking, _______ is a bad habit, is, however, popular.A.that
B.which
C.it
D.though
41.---Did you ask the guard _______ happened?
---Yes, he told me all _______ he knew.A.what;that
B.what;what
C.which;which
D.that;that 42.I shall never forget those years _______ I lived on the farm with the farmers, _______ has a great effect on my life.A.when;who
B.that;which
C.which;that
D.when;which 43.The number of the people who _______ cars _______ increasing.A.owns;are
B.owns;is
C.own;is
D.own;are
44.During the days ________, he worked as a servant at the Browns.A.followed
B.following
C.to follow
D.that followed 45.Is oxygen the only gas _______ helps fire burn? A.that
B./
C.which
D.it
46.The clever boy made a hole in the wall, _______ he could see _____ was going on inside house.A.which;what
B.through which;what
C.through that;what
D.what;that 47.Is _______ some German friends visited last week? A.this school
B.this the school
C.this school one
D.this school where 48.John got beaten in the game, _______ had been expected.A.as
B.that
C.what
D.who 49.I have bought two ballpens, _______ writes well.A.none of them
B.neither of them
C.neither of which
D.none of which 50.All that can be eaten _______ eaten up.A.are being
B.has been
C.had been
D.have been
参考答案
参考答案及解析
1.A.which用作关系代词，在定语从句中作主语。
2．C.“和谁讲话”要说speak to sb.本题全句应为Do you know the man whom I spoke to.。whom是关系代词，作介词to的宾语，可以省略。3.D.where是关系副词，表示地点，在定语从句中作地点状语。4.C.when是关系副词，表示时间，在定语从句中作时间状语。
5．A.which是关系代词，在从句中作forget的宾语。其他几个答案都不能作宾语。6．C.解析同第5题。7.A.解析见第3题。
8.A.本句话的先行词应该是films,因此，关系代词that是负数概念，其谓语动词应用复述的被动语态have been shown。如果句中的one前面使用了定冠词the，则the one应该视为先行词。
9.A.“谈到某事物”应说talk about sth.。about是介词，其后要用which作宾语，不能用that。10.A.with which是“介词+关系代词”结构,常用来引导定语从句.with有“用”的意思,介词之后只能用which,不能用that.with which在定语从句中作状语,即he is writing with a pen.11.C.in front of which 即in front of a farmhouse.In front of which在从句中作状语.12.D.with whom引导定语从句.with whom放在从句中即为:my father works with the engineer.13.D.whose引导定语从句,在从句中作主语family的定语.14.A.that引导定语从句,因为先行词是all,所以只能选用that引导.15.D.the same........as是固定用法, as引导定语从句时,可以作主语,宾语或表语.在本句话中,as作从句的主语.16.D.such.........as是固定用法,as引导定语从句时,可以作主语,宾语或表语.在本题中,as作表语.17.B.as作关系代词可以单独用来引导非限制性定语从句。这时as所指代的不是主句中某个名词，而往往指代整个主句的含义。as在从句中可以作主语、宾语。从句可放在主句后，也可置于主句前。在本句中,as作宾语.18.B.Li Ming enjoyed it very much是主句,with whom I went to the concert是定语从句.with whom放在从句中为:I went to the concert with Li Ming.19.C.as引导定语从句时通常构成such...as或the same...as固定搭配，其中such和same修饰其后的名词，as为关系代词，指代其前的名词引导定语从句。as在从句中可以作主语、表语或宾语。Such修饰单数名词时,要用such a........,本题中such books, such直接修饰复数名词.20.B.things和persons是先行词.当定语从句要修饰的先行词是既表示人,又表示物的名词时,其关系代词要用that.21.D.who引导非限制性定语从句,who作从句的主语.22.C.two thirds of whom 即:two thirds of the 2,000 workers.23.D.先行词person后有两个定语从句,第一个从句省略了关系代词whom.因为, whom作从句中met的宾语,可以省略.第二个从句who could do it.who在从句中作主语,不可省略.24.A.whose title引导非限制性定语从句,whose title也可以说成the title of which 25.A.for which 引导定语从句,使用介词for,是来自于从句中的固定短语 be famous for “以........而闻名”.26.C.当先行词被such修饰时,引导定语从句的关系代词要用as.As在本从句中作主语.27.A.两个先行词the day都是表示时间的名词,但第一个空白处要填的关系词在从句中作状语,因此要用关系副词when.第二个空白处要填的关系词在从句中作动词spent的宾语,因此要用关系代词which或that来引导定语从句.28.D.在way、distance、direction等词后的定语从句中，常用that来代替“in(或其他介词)+which”、when或where，而that常可省略。29.D.for which在定语从句中作原因状语,可用why 来替代.30.B.which I have looked after 构成一个非限制性定语从句.31.A.The reason why...was that....已成为一种固定句型，这一句中的why和that不能随意换位，也不能将that改成because，尽管that这个词在译文中可能有 “因为”的含义。32.B.非限制性定语从句常用which引导,which表示前句话的整个含义.33.A.解释见28题.34.D.主句中的two表明不能选A.从句中的are表明不能选B.both of which用来引导非限制性定语从句.35.C.as引导定语从句时通常构成such...as或the same...as固定搭配，其中such和same修饰其后的名词，as为关系代词，指代其前的名词引导定语从句。as在从句中可以作主语、表语或宾语。本题中as作从句的主语.36.B.非限制性定语从句常用which引导,which表示前句话的整个含义.37.D.38.D.解析见35题.39.A.he makes是定语从句, 从句前省略了关系代词that.40.B.which is a bad habit 非限制性定语从句.41.A.what happened是宾语从句.all 之后that he knew是定语从句.先行词是all,所以关系代词只能用that.42.D.years是表示时间的名词,用when引导定语从句,是因为when在从句中作时间状语.第二个空选用which,引导一个非限制性定语从句.43.C.本句话的定语从句是who own cars.其先行词是people,因此,定语从句的谓语动词要用复数的own。本句话主句的主语是The number of指“.....的数目”，是单数概念。因此，主句的谓语动词要用is。
44.D.that followed是定语从句，关系代词that在从句中作主语。45.A.先行词gas被only修饰，关系代词要用that，而不用which。46.B.through which引导定语从句，through which即through the hole,在定语从句中作状语。What引导的是see的宾语从句，并作从句的主语。
47.B.为便于理解，改写本句话：This is the school that some Germanfriends visited last week.不难看出，作表语的the school是先行词。that引导了定语从句，因为that同时又作visited的宾语，所以被省略了。其它选项结构不对。
48.A.解释见35题。
49.C.因为是two ballpens, 并且定语从句的谓语writes是单数概念。因此，C是正确选项。50.B.本句话中，主句的主语是all,为抽象概念。因此，其谓语应用单数的has been。关系代词that引导定语从句，并在从句中作主语。
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