单项选择题

The project required ten years of diligent research.

A. hardworking
B. social
C. basic
D. scientific
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单项选择题
The two banks have announced plans to merge nest year.
A. combine
B. sell
C. close
D. break
单项选择题
Many cities have restricted smoking in public places.
A. limited
B. allowed
C. stopped
D. kept
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