单项选择题

If I ______ harder for the final exam, I should have passed it.

A．study
B．had studied
C．studied
D．was studying
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单项选择题
The ______ prosperous the city becomes, the ______ pleasant it is to live in.
A．most.., fewer
B．more.., fewer
C．more.., less
D．most.., less
单项选择题
______ he will go to Germany is not decided.
A．Who
B．if
C．That
D．Whether
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