【英语】 名词性从句选择题练习(1)
英语名词性从句选择题30道
英语名词性从句选择题30道1. （）makes mistakes must correct them.A. WhatB. ThatC. WhoeverD. Whatever答案：C解析：whoever 表示“无论谁”，在句中引导主语从句，作主语，意为“无论是谁犯了错都必须改正”。
what 和whatever 引导名词性从句时，在从句中充当成分，此处从句不缺成分，A、D 选项不符合；that 引导主语从句时，在从句中不充当成分且没有实际意义，此处语义不符，B 选项不正确。
2. （）has helped to save the drowning girl is worth praising.A. WhoB. The oneC. AnyoneD. Whoever答案：D解析：whoever 表示“无论谁”，在句中引导主语从句，作主语，意为“无论是谁救了溺水的女孩都值得赞扬”。
who 表示“谁”，但没有“无论谁”的意思，A 选项不符合；the one 表示“那个人”，不能引导从句，B 选项不正确；anyone 表示“任何人”，不是引导词，C 选项不符合。
3. （）you don't like him is none of my business.A. WhatB. WhoC. ThatD. Whether答案：C解析：that 引导主语从句，在从句中不充当成分且没有实际意义，此处that 引导的从句“you don't like him”表示一个事实，即“你不喜欢他”，C 选项正确。
what 和who 在从句中要充当成分，A、B 选项不符合；whether 表示“是否”，语义不符，D 选项不正确。
4. （）comes will be welcome.A. WhoeverB. WhoC. No matter whoD. Anyone答案：A解析：whoever 表示“无论谁”，在句中引导主语从句，作主语，意为“无论谁来都受欢迎”。
高一英语下名词性从句(含答案)
高一下学期语法练习---名词性从句1. 连接词(不充当从句的任何成分)：2. 连接代词(作从句主干成分):3. 连接副词(作从句状语):一、选择题：1.Can you make sure ____ the gold ring?A. where Alice had putB. where had Alice outC. where Alice has putD. where has Alice put归纳1：从句的语序必须为___________________，即“引导词+主语+谓语”2._____ we need money is quite clear.A. IfB. WhatC. ThatD. \归纳2：当从句不缺成分和意思，应选____________作连接词。
3._____ the car can be used has not been known yet.A. IfB. WhatC. ThatD. Whether归纳3：当主句意思为不确定（如：has not been known, There is still some doubt）时，不能选that作从句连接词，应选wh-引导词。
4._______we can’t understand is why he didn’t join us in our discussion.A. ThatB. WhichC.WhyD. What归纳4：当从句成分上缺主干成分（如：we can’t understand ... 后缺宾语）时，应选连接代词。
5.The fact _______ he is a model teacher is well-known.A. whatB. whichC. whyD. that归纳5：当从句不缺成分和意思，选___________作连接词，且作fact后的同位语从句引导词时，不能省略。
6.They expressed the hope_______ they would come over to China again.A. whichB. whomC. whatD. that7.Word came ________ his poem won the first prize.A. thatB. whetherC. asD. because8.China is not ________ she used to be.A. thatB. whichC. likeD. what归纳6：当从句不缺成分（如she did it 中主谓宾结构齐全），应选_____________；而结合主句，从句缺意思“为什么”，因此根据全句所缺意思，答案应为______________ 。
高考英语名词性从句知识点知识点总复习附答案解析(1)
高考英语名词性从句知识点知识点总复习附答案解析(1)一、选择题1．— Would you please tell us the prospect of fighting against COVID-19?—We are sure to win the battle, but ______ it’ll be over soon I’m not sure at the moment. A．whether B．that C．if D．when2．______ they have won the game made us excited.A．/B．That C．What D．Which3．It is by no means clear the local government will do with the buildings of poor quality. A．what B．how C．whether D．which4．It is exactly ______ we behave ______has changed the world.A．which; that B．how; that C．how; what D．what; that5．Thor is no longer _______ he was two years ago.A．that B．who C．what D．which6．I know nothing about the young lady _______ she is from Beijing.A．except B．that C．except that D．except for 7．Then he told me _______ he was doing was very important.A．that B．that how C．what that D．why what8．The Qingming Festival, now a national holiday, allows more people to pay their respects to dead relatives on would otherwise be a workday like Friday.A．where B．thatC．when D．what9．It is widely believed that _______ has necessary good qualities is more____ to achieve success in their career.A．whoever; possible B．who; likely C．who; possible D．whoever; likely 10．It is generally acknowledged that loving your life is _____ the key to happiness lies. A．what B．why C．where D．whether11．The other day, my brother drove his car down the street at _____ was a dangerous speed. A．as B．what C．which D．that12．The only time my father really stops thinking about work is_____our whole family are on vacation.A．that B．when C．where D．which13．If you are addicted to your mobile phone, that’s ______ you should lay it down and be involved in meaningful activities.A．when B．why C．where D．how 14．(2016·天津)The manager put forward a suggestion __________ we should have an assistant. There is too much work to do.A．whether B．thatC．which D．what15．Social media paints this rosy picture that everyone else 's lives are perfect,but things are seldom_______they seem.A．which B．what C．how D．where16．He sold his house for twice ________ he paid for it so he did well out of the deal.A．how B．what C．that D．which17．My grandmother helped me believe that I could accomplish ____________ I put my mind to. A．whenever B．whatever C．wherever D．whichever 18．There is a general consensus among teachers _____ children should have a broad understanding of the world.A．where B．whether C．that D．how19．The companies are working together to create _________ they hope will be the best means of transport in the 21st century.A．which B．that C．one D．what20．Police have found ________ appears to be the lost ancient statue.A．which B．where C．how D．what 21．Modern science has given evidence _________ smoking can lead to many diseases. A．what B．whichC．that D．where22．—It’s reported that the new undergroun d line has been completed.—Yes, but it hasn’t been made clear it’s to be opened to traffic.A．that B．who C．what D．when23．He explained ______ for his father's birthday party.A．why was he late B．why is he lateC．why he is late D．why he was late24．Exactly______ the potato was introduced into Europe is uncertain, but it was probably around 1565.A．whether B．whyC．when D．how25．The spokesman noted _______ some individuals apparently lack is not the means to get the correct information, but the courage to admit the truth.A．whether B．that C．which D．what【参考答案】***试卷处理标记，请不要删除一、选择题1．A解析：A【解析】【分析】【详解】考查名词性从句连接词。
【英语】名词性从句练习题(含答案)
英语】名词性从句练习题（含答案）一、名词性从句1． He took a trip to Beijing last week and he saw at the Forbidden City impressed himdeeply.A.that B . how C . what D . which 【答案】 C【解析】【分析】句意：上周他到北京旅行了，他在故宫所看到的给他留下了深刻的印象。
分析句子结构可知，连词 and 后为一个名词性从句，因此应该使用 what 引导，且 what 在从句中作主语，故选 C。
【点评】考查名词性从句，本题涉及 what 引导的主语从句。
2． It has been pointed out _ plays a vital role in driving away one's anxiety is one'ssweet childhood memories.A.what thatB. whichC. thatD. that what【答案】 D【解析】【分析】句意：有人指出，驱除焦虑所起着至关重要的作用是童年美好的回忆。
本句时一个主语从句， it 作形式主语，真正的主语为 that what plays a vital role in driving away one's anxiety is one's sweet childhood memories. ，主语从句中又有一个主语从句，且此主语从句中缺少主语，所以用what 引导。
故选 D。
【点评】考查名词性从句，本题涉及 what 引导的主语从句。
3． is clear to the members of the committee is that the President will not give in to their demands.A. Who B . It C . As D . What【答案】 D【解析】【分析】句意：委员会成员清楚的是，总统不会向他们的要求让步。
高一英语名词性从句单选题30题
高一英语名词性从句单选题30题1._____ wins the election will face many challenges.A.WhoeverB.WhomeverC.No matter whoD.No matter whom答案：A。
本题考查主语从句连接词。
“Whoever”在主语从句中既作连接词又在从句中作主语，表示“无论谁”；“Whomever”在从句中作宾语；“No matter who”和“Whoever”意思相近，但不能引导名词性从句。
这里需要在主语从句中作主语，所以选“Whoever”。
2._____ caused the accident is still under investigation.A.WhatB.WhichC.ThatD.Whether答案：A。
“What”在主语从句中作主语或宾语，表示“什么”；“Which”在有选择范围时使用；“That”在主语从句中不充当成分，只起连接作用；“Whether”表示“是否”。
这里需要一个词作主语，表示“什么导致了事故”，所以选“What”。
3._____ he will come or not is not certain.A.WhetherB.IfC.ThatD.What答案：A。
“Whether”和“If”都有“是否”的意思，但在引导主语从句、表语从句、同位语从句时只能用“Whether”；“That”在主语从句中不充当成分；“What”在主语从句中作主语或宾语。
这里表示“他是否会来不确定”，所以选“Whether”。
4._____ surprised us most was his excellent performance.A.WhatB.ThatC.WhichD.Whether答案：A。
“What”在主语从句中作主语或宾语，表示“什么”；“That”在主语从句中不充当成分；“Which”在有选择范围时使用；“Whether”表示“是否”。
八年级英语名词性从句练习题40题(带答案)
八年级英语名词性从句练习题40题(带答案)1. ______ is a pity that we can't go to the concert tonight.A. ItB. ThatC. ThisD. What答案解析：A。
在这个句子中，“It”作形式主语，真正的主语是“that we can't go to the concert tonight”这个主语从句。
这是为了避免句子头重脚轻的结构。
选项B“That”引导主语从句时，一般不用于这种句型中；选项C“This”不能作形式主语引导主语从句；选项D“What”引导主语从句时在句中要充当成分，而这里不需要。
2. ______ he will come to the party is still a question.A. WhetherB. IfC. ThatD. Who答案解析：A。
“Whether”表示“是否”，在这里引导主语从句，表示他是否会来参加派对还是个问题。
“If”不能引导位于句首的主语从句，所以选项B错误；选项C“That”在句中无“是否”的含义；选项D“Who”引导主语从句时在句中要充当人相关的成分，这里不适用。
3. ______ makes me happy is that I can have a long holiday.A. ItB. ThatC. WhatD. Which答案解析：C。
“What”在这个句子中引导主语从句，并且在从句中充当主语，表示“什么让我开心的是我能有一个长假期”。
选项A“It”是形式主语，这里需要的是引导主语从句且在从句中作成分的词，所以A错误；选项B“That”引导主语从句时在从句中不充当成分；选项D“Which”表示“哪一个”，不符合句子语义。
4. ______ we need is more time to practice English.A. WhatB. ThatC. WhichD. It答案解析：A。
【英语】名词性从句 复习(word)(1)
【英语】名词性从句复习（word）(1)一、名词性从句1．It was never clear ________ the man hadn't reported the accident sooner.A. thatB. howC. whenD. why【答案】 D【解析】【分析】句意：这名男子没有早点报告这次事故的原因根本没有搞清楚。
It在句中是形式主语，真正的主语是why引导的主语从句。
故选D。
【点评】考查名词性从句，本题涉及why引导的主语从句。
2．Has it been announced ______?A. when are the planes to take offB. that are the planes to take offC. where are the planes to take offD. when the planes are to take off【答案】 D【解析】【分析】句意: 飞机什么时候起飞已经宣布了吗？此处是when引导的主语从句，且要用陈述句语序，故选D。
【点评】考查名词性从句，it作形式主语，关系副词when引导的从句作真正的主语。
3．In the past decade, our education system too much on grades. However, grades have a direct connection with future success is still a question.A. focused; whetherB. focused; ifC. has focused; whetherD. has focused; if【答案】 C【解析】【分析】考查时态和主语从句。
根据In the past decade,在最近的几十年里，可知句子用现在完成时态，our education system是句子的主语，单数形式，所以第一空填has focused；第二空是主语从句做主语，if是否，不能引导主语从句，所以第二空填whether。
英语语法-名词性从句部分选择题
英语语法练习题（名词性从句部分）名词性从句部分1. ____ I want to know is ____ it is worth doing.A. What; thatB. What; whetherC. That; whyD. That; what2. ____ visits the Great Wall will be struck by it.A. AnyoneB. EachC. WhoeverD. Everybody3. ____ the workers insisted on was that they ____ more pay.A. That; must be givenB. What; should giveC. Whether; would be givenD. What; be given4. She asked ____.A. what I was doing when she rang me upB. What was I doing when she rang me upC. When she rang me up what was I doingD. When did she ring me up what I was doing5. Writing stories and articles ____ I enjoy most.A. is thatB. are thatC. is whatD. have been what6. He asked the tailor ____.A. how long would the coat be readyB. how soon would the coat be readyC. how long the coat would be readyD. how soon the coat would be ready7. The policeman came up to see ____.A. what the matter isB. what the matter wasC. what was the matterD. what is the matter8. ____ he told us is a ____.A. That; layB. Which; trueC. What; lieD. Whose; truth9. It was not until the headmaster came ____.A. and so the students got down to workB. did the students get down to workC. that the students got down to workD. then the students got down to work10. I wonder ____ this kind of metal can be used in the construction industry.A. howB. whatC. aboutD. which11. --- ____ you did?--- No, as a matter of fact I didn’t need to.A. Is that whatB. Is what thatC. What is thatD. Is that which12. She is pleased with ____ you have given her and all ____ you have told.A. that; thatB. what; whichC. what; thatD. all; what13. They expressed the hope ____ they would come over to visit China again.A. whichB. thatC. whetherD. for which14. ____ I wanted to say.A. Such was whatB. What was suchC. Such was thatD. That was such15. They have no idea at all ____.A. where he has goneB. where did he goC. which place he has goneD. where he has gone by16. No word came ____ he joined them in playing football.A. thatB. whetherC. whichD. what17. Word came ____ she died of old age.A. thatB. whichC. in whichD. how18. Can’t you find out ____ wrong wi th the TV set?A. whichB. that’sC. what’sD. where is19. ____ they will have a gook harvest this year is still unknown.A. WhetherB. IfC. WhichD. That20. All the books are here. You may borrow ____ you like.A. whichB. thatC. whatD. whichever21. The news ____ to Shanghai delighted all of them.A. they would goB. which they would goC. that they would goD. would go22. ____ is that I have promised to make friends with the dishonest girl.A. The only thing what I regretB. What I regret mostC. All what I really regret mostD. What that I regret most23. ____ she is living now is not known to anybody.A. WhetherB. WhenC. WhereD. Why24. This is ____ the river has been polluted.A. whatB. whyC. thatD. whether25. That is ____ he was born.A. whatB. thatC. whereD. whether26. ____ a good thing they didn’t catch you.A. That’sB. It’sC. There’sD. What’s27. ____ a pity I didn’t see you.A. That’sB. What’sC. It’sD. There’s28. ____ surprised me most ____ to see some of the village people seated on the benches at the end of the room.A. What; wasB. What; wereC. That; wasD. That; were29. He asked me ____ I was sure my mother ____.A. if; will comeB. if; would comeC. that; will comeD. that; would come30. It is said ____ Mr. Tom has arrived in New York.A. thatB. whichC. whatD. why31. John dashed back into the room, and saw ____.A. what wrong wasB. what was wrongC. if wrong wasD. if was wrong32. This is ____ the question lies.A. whatB. thatC. whereD. how33. He stood there quite still, ____ his lips moved slightly.A. except forB. exceptC. except thatD. except what34. We all know the truth ____ the moon moves around the earth.A. thatB. ifC. whatD. where35. The fact ____ she had not said anything ____ all of us.A. what; surprisedB. what; was surprisedC. that; surprisedD. that; was surprised36. ____ is unknown to us all.A. When did she arriveB. When she arrivedC. That when she arrivedD. In which she arrived37. He asked me ____ that electric fan.A. how many I paidB. how much I paid forC. how much I paidD. how many I paid for38. The Emperor ordered that the wonderful cloth ____ for him at once.A. to be wovenB. be wovenC. shouldD. would be woven39. ____ that we’ll have the find exam next week.A. He was saidB. It saidC. It was saidD. It’s said40. Which sentence is wrong?A. She said, “What a lovely day it was!”B. She said what a lovely day it was.C. She said what was a lovely day.D. She said it was a lovely day.41. The teacher told us that the sun ____ in the east and ____ in the west.A. raised; setB. raises; setsC. rises; setsD. rose; set42. I doubt ____ he will come to see me.A. whetherB. thatC. whichD. what43. He told me ____.A. that had happenedB. that had happened to himC. what had been happenedD. what had happened to him44. ____ I was tree that evening.A. It happened toB. It happened thatC. That happenedD. It is happened that45. I have no doubt ____ we shall be able to do something for you.A. whetherB. ifC. thatD. what46. I wish I ____ yesterday’s exam.A. passedB. had been able to passC. were able to passD. could pass47. I wish I ____ some use.A. could be ofB. could beC. will be ofD. will be48. ____ was said have must be kept secret.A. WhateverB. WhicheverC. HoweverD. That49. Only time will tell if we ____.A. had been succeededB. have been successC. had been successfulD. have been successful50. ____ you have written the letter in English will surprise your teacher.A. WhatB. ThatC. WhoD. How long51. He works too hard, That is ____ is wrong with him.A. that whichB. the whatC. whatD. the thing what52. We must do ____ the party ____ us.A. as; tellB. as; tellsC. what; tellD. what; tells53. It ____ Tom drives badly.A. thinks thatB. is thought whatC. thought thatD. is thought that54. ____ will be elected chairman of the club is unknown.A. WhoB. WhomC. WhichD. That55. It was ____ he worked hard that he succeeded.A. becauseB. forC. asD. since56. It was natural that my pictures ____ them.A. surprisedB. would surpriseC. should surpriseD. would have surprised57. ____ knows the truth will tell you about it.A. Who thatB. WhoeverC. Those whoD. Wham that58. Can you tell us ____ ?A. who that man isB. who is that manC. what is that manD. whose that man is59. My suggestion is ____ our teacher ____ strict with us.A. what; should beB. that; beC. which; would beD. where; was60. The reason why we are late is ____ our car didn’t come.A. whyB. thatC. becauseD. for61. I don’t know ____ he lives.A. thatB. whereC. whichD. what62. I found nothing wrong in what he ____.A. saysB. has saidC. saidD. saying63. Ask her ____ she can came to see us off.A. thatB. whetherC. whichD. what64. She looked ____ she were ten years younger.A. asB. likeC. thatD. as though65. I don’t understand ____ believe me.A. why you notB. why do you notC. why don’t youD. why you don’t66. Air, or ____ is called the atmosphere, surrounds the whole world.A. itB. whichC. whatD. that67. We all know the truth __ there are air, water and sunlight there are living things.A. whereB. whereverC. thatD. that wherever68. ____ still needs to be discussed.A. How is the plan to be carried outB. How the plan is to be carried outC. Why is the plan carried outD. Why the plan carried out69. Lanzhou is no longer ____.A. what it used to beB. what it used to likeC. like it used to beD. what it used to70. Do ____ you think is right, ____ difficulties you may have.A. what; howeverB. that; whateverC. whatever; whoeverD. what; whatever答案:1-5 BCDAC 6-10 DCCCA 11-15 ACBAA 16-20 BACAD21-25 CBCBC 26-30 BCABA 31-35 BCCAC 36-40 BBBDC41-45 CADBC 46-50 BAADB 51-55 CBDAA 56-60 CBABB61-65 BCBDD 66-70 CDBAD。
- 1、下载文档前请自行甄别文档内容的完整性，平台不提供额外的编辑、内容补充、找答案等附加服务。
- 2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
- 3、如文档侵犯您的权益，请联系客服反馈,我们会尽快为您处理(人工客服工作时间：9:00-18:30)。
【英语】名词性从句选择题练习(1)一、名词性从句1．—What impresses you most when you visit the Acropolis ?— ________ it is that has brought the grand palace into today's terrible scene.A. WhereB. WhatC. HowD. When【答案】 B【解析】【分析】句意：——当你参观雅典卫城时，你印象最深的是什么？——使我印象最深的是什么将从前宏伟的宫殿变成了今天惨不忍睹的样子。
强调句型的特殊疑问句式：疑问词（如what） is it that+其它，本句强调的是什么使得从前宏伟的宫殿蜕变的，所以用表示内容的what，选B【点评】考查主语从句和强调句，本题强调主语从句的引导词。
2．________ is known to us all that the old scientist, for ________ life was hard in the past, still works hard in his eighties.A. As; whoseB. It; whoseC. As; whomD. It; whom【答案】 D【解析】【分析】句意：我们都知道，那位老科学家，过去生活很艰苦，到了八十多岁还在努力工作。
第一空it is known to us all that…是个固定句型，意为“众所周知…”；第二空为介词+关系代词引导的定语从句，先行词the old scientist指人，作介词for的宾语，只能用whom，故选D。
【点评】考查名词性从句和定语从句，本题涉及固定句式it is known to us all that…和whom引导的限制性定语从句。
3． is even more important is the earth cooled down, water began to appear on its surface.A. When; that; whenB. What; whether; asC. What; that; asD. lt; whether; as 【答案】 C【解析】【分析】这题考查从句的用法，第一空填what引导主语从句，在主语从句中what做主语，第二空填that引导表语从句，在表语从句中，as是引导时间状语从句，句意是：甚至更重要的是：随着地球的冷却，水开始出现在表面。
选C。
4．It________that the road will be closed tomorrow for repairs.A. was announcedB. has been announcedC. had been announcedD. would be announced【答案】 B【解析】【分析】本题考查动词的时态和语态。
题干句子中that到句子结束是宾语从句，且从句动词用“will＋动词原形”表示将来，由此推断出空白处谓语动词应用现在的某种时态，在所给四个选项中，只有B项正确。
【点评】考查现在完成时的被动语态，其结构是have/has +been +done。
需要注意宾语从句的时态。
主句用现在时，从句所需的任何时态。
5．--- made her ashamed of herself?--- the lowest mark in her class.A. What; Because she gotB. Was it what; GettingC. What was it that; That she gotD. What was it that; Get【答案】 C【解析】【分析】句意：——是什么让她对她自己感到羞愧？——是她获得了她班上的最低分让她惭愧。
A中的what是句子的主语，但是because引导的从句不作主语，是原因状语从句，故排除；B的第一空是错误形式，故排除；C、D两项的第一个选项是一样的，说明第一个题干是一个强调句型，特殊疑问句下的强调句型，有what引导；第二个空是对what的回答，因为what是上一句的主语，That she got the lowest mark in her class是从句，可以作主语；而D项的get是动词原形，不能作主语，故答案为C。
【点评】考查强调句型的使用和对特殊疑问句的回答，注意问什么回答什么，也就是说疑问词what是句子的主语，回答的内容也需要在句子中能作主语。
6．____ made me more unhappy was ___ the boy asked my friend to be his girlfriend and she agreed.A. What; thatB. That ; thatC. What; whetherD. It; that【答案】 A【解析】【分析】句意：让我更不高兴的是那个男孩要求我的朋友做他的女友，她同意了。
第一空填what,它一方面在句子中引导主语从句,另一方面又在主语从句中作主语；第二空用that引导表语从句且从句中不缺成分,表示对前面情况的说明。
故选A。
【点评】考查了名词性从句，本题涉及what引导的主语从句以及that引导的表语从句。
7．_______ you don't like him is none of my business.A. WhatB. WhoC. ThatD. Whether【答案】 C【解析】【分析】句意：你不喜欢他，跟我没有什么关系。
you don't like him为主语从句，其内容已经是完整的，所以用that，且引导主语从句的that不能省略。
8．______ is our belief that improvements in health care will lead to a stronger, more prosperous economy.A. WhichB. WhatC. ItD. As【答案】 C【解析】【分析】句意：医疗保健的进步将促进一个更强大、更繁荣的经济，这是我们的信念。
that引导的是主语从句，故空格处应该用it作形式主语，代替真正的that引导的主语从句。
故答案选C。
【点评】考查it的用法，以及主语从句的应用。
9．They lost their way in the forest, and ________ made matters worse was that night began to fall.A. thatB. itC. whatD. which【答案】 C【解析】【分析】句意：他们在森林里迷路了，更糟糕的是天开始黑了。
根据连词and可知，本句需要一个引导主语从句的连接词，该词同时还要能在从句里充当主语。
that不能在句中作成分；it不能引导主语从句；which意为“哪一个”，不符合本句语境。
排除A、B、D三项。
故选C。
【点评】考查名词性从句，本题涉及what引导的主语从句的应用。
10．It matters little ______ a man dies, but _____ matters much is ______ he lives.A. how; what; howB. how; it; howC. why; it; whyD. that; what; that 【答案】 A【解析】【分析】句意：一个人如何死去并不重要，重要的是他如何生活。
it为形式主语，how从句为真正的主语。
What matters much （=the thing that matters much）。
第一个how引导的是一个主语从句；it作形式主语；what引导的是主语从句；第二个how引导的是表语从句。
故选A。
【点评】考查名词性从句，本题涉及主语从句和表语从句的应用。
11．Exactly _________ the potato was introduced into Europe is uncertain, but it was probably around 1565.A. whetherB. whenC. whyD. how【答案】 B【解析】【分析】句意：土豆被引进欧洲具体的事件不被确定，但是可能是在1565年左右。
根据时间状语round 1565得知这里是指时间不确定。
故选B。
【点评】考查名词性从句，本题涉及when引导的主语从句。
12．_______ makes me feel worried is _______ singing stars are centered on by masses of teenagers today.A. What; whatB. That; thatC. What; thatD. That; what【答案】 C【解析】【分析】句意：让我感到担忧的是，今天的歌星是以青少年为中心的。
分析句子可知，主语从句中的谓语动词makes 缺少主语，主语从句中缺少宾语一般用what，因此选择 what 来引导主语从句；系动词 is 后面的表语从句句意完整，不缺少成分，因此选择 that 引导表语从句。
分析选项可知C项符合题意，故选C。
【点评】考查名词性从句，本题涉及what引导的主语从句和that引导的表语从句的应用。
13．_______ is troubling me is ______ I don't understand ________ he saidA. What; that; whatB. What; what; whatC. That; that; whatD. Why; that; which 【答案】 A【解析】【分析】句意：我烦恼的是我不明白他说的话。
第一空是主语从句，从句中缺主语，要用What；第二空是表语从句，从句不缺成分，所以要填that；第三空是宾语从句，从句中的动词understand缺宾语，要填what。
故选A。
【点评】考查名词性从句，本题涉及主语从句，表语从句和宾语从句的应用。
14．It has been pointed out ________ plays a vital role in driving away one's anxiety is one's sweet childhood memories.A. what thatB. whichC. thatD. that what【答案】 D【解析】【分析】句意：有人指出，驱除焦虑所起着至关重要的作用是童年美好的回忆。
本句时一个主语从句，it作形式主语，真正的主语为that what plays a vital role in driving away one's anxiety is one's sweet childhood memories.，主语从句中又有一个主语从句，且此主语从句中缺少主语，所以用what引导。