单项选择题

Never______seen so many people cooperating in such an event.

A. is the world
B. has the world
C. the world is
D. the world has
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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
单项选择题
I will have finished in the bathroom______a few minutes.
A. after
B. with
C. in
D. on
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