引导名词性从句的连接词可分为三类：

连词：that(无任何词意)

whether, if(均表示“是否”表明从句内容的不确定性)

as if ,as though(均表示“好像”，“似乎”)

　以上在从句中均不充当任何成分

　连接代词：what, whatever, who, whoever, whom, whose, which. whichever, whomever

　连接副词：when, where, how, why

　不可省略的连词：

1. 介词后的连词

13.The road is covered with snow. I can’t understand ________ they insist on going by motor-bike.　　

A. why　　　　　　 B. whether　　　　　 C. when　　　　　　　 D. how

12.You are saying that everyone should be equal, and this is ________ I disagree.

A. why　　　　　　 B. where　　　　　 C. what　　　　　　　 D. How

11.- Are you still thinking about yesterday’s game?

- Oh, that’s ____________.　

A. what makes me feel excited　　　　 B. whatever I feel excited about

C. how I feel about it　　　　　　　 D. when I feel excited

10.______ made the school proud was ______ more that 90% of the students had been admitted to key universities.

A.What…because　B.What…that　C.That…what　D.That…because

9.There is a new problem involved in the popularity of private cars ____________ road conditions need ____________.

A. that; to be improved　　　　　 B. which; to be improved　

C. where; improving　　　　　　　 D. when; improving

8.It is pretty well understood __________controls the flow of carbon dioxide in and out the atmosphere today.

A.that　　　　 B.when　　　　　　 C.what　　　　　　　　　 D.how　

7. A plan has been put forward __ more graduates should go to work in the country

A. when　　　 B. that　　　　　 C. whether　　　　　　　　 D. how

6. After three hours’ climbing , they reached 　　　　　　they thought was the place they’d been dreaming of .

A．what　 　　　B．which　　　　　 C．where　　 　　　　　　　　　　　 D．that

5.--- The patient looks much better. 　　　is it that has made him 　　　　he is today?

--- Perhaps the special medicine and his family’s patient care.　

A．What; that　 B．That; that　　　 C．What; what　　　 　　　　 D．What; which