单项选择题

More than one student ______ ever been to the Great Wall.

A. have
B. has
C. had
D. was
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单项选择题
A qualified teacher should have good manners and ______ knowledge.
A. extensive
B. expansive
C. intensive
D. expensive
单项选择题
If only the committee ______ the regulations and put them into effect as possible.
A. approve
B. will approve
C. can approve
D. would approve
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