单项选择题

Professor Liu______for 20 years by the end of next summer.

A. has taught
B. will be teaching
C. has been teaching
D. will have taught
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I will have finished in the bathroom______a few minutes.
A. after
B. with
C. in
D. on
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The leaders met to discuss the problems facing their______countries.
A. respective
B. respected
C. respectable
D. respectful
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