单项选择题

This is one of the rarest questions that ______ at such a meeting.

A. is raised
B. are raised
C. has ever been raised
D. have ever been raised

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单项选择题

George enjoys talking about people's private affairs. He is a ______.

A. solicitor
B. coward
C. gossip
D. rebel

单项选择题

Not until science became prominent ______ be abolished, some people argue.

A. did slavery come to
B. slavery to
C. had slavery come to
D. that slavery came to

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