6. B

主语从句_____people with mental-health problem want缺少宾语，要用what引导，且充当want的宾语。故选B。

5. D

they thought 为插入语，可以去掉，则就可以看出宾语从句中缺少主语。whoever=anyone who。故选D。

4. B

主语从句____made things worse 缺少主语，应用what引导。that在名词性从句中连接词的作用，不充当任何成份。故选B。

3. B

at what time=when，引导宾语从句，when在从句中充当时间状语。故选B。

2. B

　when引导表语从句，表示时间。故选B。

1．A

本题含有强调句型，若把It is···that去掉，则很容易地看出what引导的宾语从句，what在从句中充当主语。故选A。

40.　 ______ he met with the difficulty did he realize the importance of our help.

　 A. Even though　　 　B. Never until　　　 C. Only before　　　 D. Ever since

[答案与解析]

39. The women carrying babies , come in first ,　　　 　?

　　 A．will you 　　　　　　　 B．will they 　　　　　　 C．do you 　　　　　　　 D．don’t you

38．In no country other than Britain, it has been said, ____ experience four seasons in the 　course of a single day.

A. people can　　　　　 B. you can　　　 C. can it　　　　　　　　　　 D. can one

37. They have no idea at all ____.

A. what he is working on　　　　　　 B. what is he working on

C. what did he work on　　　　　　 D. what he is working