单项选择题

We must stop him（）

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

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单项选择题

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

A．should
B．does
C．did
D．might

单项选择题

We don't know the woman（）he talked this morning.

A．to whom
B．who
C．to which
D．that

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