单项选择题

Never before ______ so highly successful in changing his surroundings.

A. man has been
B. man is
C. has man been
D. is man
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单项选择题
So far there is no proof ______ people from other planets do exist.
A. which
B. how
C. what
D. that
单项选择题
A. Yes, you may. B. Certainly. Here you are. C. Sure. You’re welcome. D. Why not
A. Yes, you may. B. Certainly. Here you are.
C. Sure. You’re welcome. D. Why not
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