21. We often think of the days ______ we spent together on the island.
A. when
B. which
C. in which
D. during which
22. Have you ever been to Shanghai, ______ I left ten years ago?
A. where
B. which
C. that
D. when
23. He has left Beijing, ______ a meeting is to be held.
A. when
B. where
C. as
D. which
24. This is the very place ______ I'm wishing to live in.
A. where
B. which
C. that
D. in which
25. Is it in that factory ______ "Red Flag" cars are made?
A. in which
B. where
C. that
D. which
26. I have bought the same dress ______ she is wearing.
A. as
B. that
C. which
D. than
27. Can you solve such problems ______ raised by the audience?
A. what were
B. as were
C. that were
D. which were
28. The reason ______ he didn't come was ______ he was injured.
A. that, because
B. why, that
C. why, because
D. that, that
29. He must be from Africa, ______ can be seen from his skin.
A. that
B. as
C. it
D. what
30. His father died last year, ______ made it impossible for him to go abroad.
A. when
B. which
C. as
D. that
参考答案：
1-5 ACCBC 6-10 CBDCA
11-15 CDCAC 16-20 CDACA
21-25 BBBCC 26-30 ABBBB
