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
We don't know the woman ______ he talked this morning.
A．to whom
B．who
C．to which
D．that
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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