单项选择题

__________ had enough time, they would have visited the Great Wall.

A．Had they
B．Have they
C．Would they have
D．If they
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Hisgood sense of humor made a deep impression __________us.
A．in
B．on
C．for
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He had so little education __________ he was unfit for this job.
A．but
B．what
C．as
D．that
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