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

We must stop him（）

A．to smoking
B．that smokes
C．from smoking
D．smoke

单项选择题

Only when one loses freedom（）one know its value.

A．should
B．does
C．did
D．might

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