[例1]We were not surprised at______，for he had worked so hard.

A.what has he achieved　B.that what he had achieved

C.what he had achieved　D.that he had achieved

【解析】答案C。at是介词，其后接宾语从句时，从句要用陈述句的语序。achieve是及物动词，what在从句中作宾语，所以选C。that在从句中只起连接作用，无意义。

[例2]______I saw was two men crossing the street.

A.What　B.Whom　C.Who　D.That

【解析】答案A。本句中的主语是主语从句，what在从句中作宾语。

[例3]Would the news______he failed to pass the exam bother you？

A.which　B.that　C.of which　D.on which

【解析】答案B。由于从句he failed to pass the exam 是news的内容，所以这是一个同位语从句，应该用that引导。

[例4]The fact ______he does so in so short period of time challenges explanation.

A.why　B.that　C.what　D.which

【解析】答案B。fact后的从句讲的是fact的内容，所以是同位语从句，引导同位语从句的连词只能使用that。

[例5]The old gentleman never fails to help______is in need of his help.

A.whom　B.who　C.whoever　D.whomever

【解析】答案C。本句中需要填入一个连接代词引导宾语从句，且此代词要在从句中作主语。A、D都只能作宾语。whoever引导宾语从句。who也可以引导宾语从句，但whoever强调无论谁。

[例6]______was unimportant.

A.Whether he enjoyed our dinner or not

B.No matter how he enjoyed our dinner

C.If he enjoyed our dinner

D.What he enjoyed our dinner

【解析】答案A。本句中包含一个主语从句，意思是“他是否喜欢我们的饭不重要”。只有A最符合题意。B、C中的No matter how 和If 都引导状语从句；D项中的what在从句中作主语或宾语，而本从句中有主语和宾语。

[例7]How long do you think______to finish this urgent task？

A.did it take you　B.it will take you

C.will it take you　D.it to take you

【解析】答案B。think后接宾语从句。从句不倒装。

[例8]______was not the way the event happened.

A.Which the press reported　B.That the press reported

C.What did the press report　D.What the press reported

【解析】答案D。此处需填入一个主语从句。在这个主语从句中作动词report的宾语应该用连接代词what。

[例9]No one doubts______it is true.

A.whether　B.if　C.that　D.what

【解析】答案C。doubt用在肯定句中后接if引导的从句，用在否定句中后接that引导的从句。

[例10]There is much chance______Bill will recover from his injury in time for the race.

A.that　B.which　C.until　D.if

【解析】答案A。that在此引导同位语从句，修饰chance，又如：There was a chance that my letter would arrive in time.我的信有可能准时到达。

[例11]We haven’t settled the question of______it is necessary for him to study abroad.

A.if　B.where　C.whether　D.that

【解析】答案C。根据句意，空格处应填一个表示“是否”的词，但在A和C两个表示“是否”的选项中，if不能用于介词后，故选C。

[例12]— Could you do me a favour？— It depends on______it is.

A.which　B.whichever　C.what　D.whatever

【解析】答案C。what在此引导宾语从句，what在宾语从句中用作表语，句意为：这要看是什么（即这要看你要我帮什么忙）。

[例13]____makes this shop different is that it offers more personal services.

A.What　B.Who　C.Whatever　D.Whoever

【解析】答案 A。what在此引导主语从句，意思上相当于the thing that。

[例14]______team wins on Saturday will go through to the national championships.

A.No matter what　B.No matter which

C.Whatever　D.Whichever

【解析】答案D。从句意上看，应为一个表示“无论哪一个”的选项，因此B和D比较合适，但No matter which只用于引导状语从句，不用于引导名词性从句，故不能选B。

[例15]—It’s thirty years since we last met.—But I still remember the story，believe it or not，______we got lost on a rainy night.

A.which　B.that　C.what　D.when

【解析】答案B。that在此引导同位语从句，修饰名词the story。此题的难点是，其中插入了believe it or not，使问题变得复杂了。