20. The question is_____the book was worth reading.
A. which
B. whether
C. what
D. that

21. We are talking about _____Mary is in love with a sailor.
A. if
B. whether
C. where
D. what

22. _____you hurry, you will be late.
A. If
B. As
C. Unless
D. Because

23. She acted_____nothing had happened.
A. as
B. though
C. as if
D. since

24. The metal _____was first used was copper_____it was easily obtained in its pure（纯的）state.
A. what…because…
B. that…where…
C. which…as…
D. that…when…

25. _____ you have seen the play you can give him the ticket.
A. When
B. Since
C. That
D. Where

26. _____I know it is difficult, I shall do it.
A. If
B. In case
C. Though
D. Since

27. The story was_____moving_____ many of us shed tears.
A. such…that
B. as…as
C. so…as
D. so…that

28. It’s_____that we must not miss it.
A. such good a chance
B. so an good chance
C. a so good chance
D. such a good chance



参考答案:
20.B
21.B介词后跟名词性从句时只能用whether不能用if 
22.C   23.C   24.C     25.B    26.C    27.D    28.D