单项选择题

You had better try to avoid （） such a mistake again.

A. make
B. making
C. made
D. be made

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单项选择题

If hasn't been decided （） the meeting will be held or not.

A. that
B. which
C. if
D. whether

单项选择题

We don't think David can manage a company, （）。

A. do we
B. don't we
C. can he
D. can't he

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