1. B　 2. C　 3. C 4. C　 5. B　 6. B　 7. B　 8. C　 9. C　 10. C　 11. B　 12.D　 13. B　

20.　 He spoke in a quiet, distinct voice, as though his thought _____.

A. was far away　　 B. had been far away　 C. were far away　　 D. went far away.

参考答案：

19.　 If only I _____ how to operate an electronic computer as you do.

A. had known　　　 B. would know　　　 C. should know　　 D. knew

18.　 It is required that you ____ at six.

A. will arrive　　　　 B. arrive　　　　　 C. arrived　　　　　 D. would arrive

17.　 If it ___ tomorrow, what would we do?

A. rains　　　　　 B. were to rain　　　 C. would rain　　　　 D. rain

16. But for the party, he ___ of hunger 30 years ago.　

A. would have died　 B. would die　　　 C.　 must have died　 D.　 must die

15.　 The man insisted that he _____ there.

A. should send　　　　 B. would be sent　　　　 C. sent　　　　　 D. be sent

14.　 He demanded that the laboratory report ___ immediately after the experiment was done.

A. was written　　　 B. be written　 　　　C. must be written　　　 D. would be written

13.　 How I wish I ____ to reapair the watch!　 I only made it worse.

A. had tried　　　　　 B. hadn't tried　　　 　　　C. have tried　　　　　　 D. didn't try