单项选择题

A. She’s sick. B. She’s fired.
C. She quarreled with her boss. D. She received a warning from her boss.
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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
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
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