21. It will be a long time _______ he _______ back from Berlin.
A. when; will come
B. before; comes
C. after; is coming
D. since; comes
22.—Are you sure that you’ve met him before?
—______ I’m mistaken.
A. If
B. Since
C. Unless
D. More than
23. Does it matter _______ it rains tomorrow?
A. that
B. whether
C. if
D. as
24.—Do you remember _______ he came?
—Yes, I do. He came by car.
A. how
B. when
C. that
D. if
25. Be sure to write to us, _______?
A. will you
B. aren’t you
C. can you
D. mustn’t you
參考答案：
1～5 CDCAD
6～10 BCCBB
11～15 BBDDA
16～20DBBDA
21～25 BCCAA
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