单项选择题

The fact______exercise is good for health is known to all．

A．which
B．what
C．that
D．it
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单项选择题
______what to do,the man telephoned the police．
A．Not known
B．Not knowing
C．Don't know
D．Knowing not
单项选择题
It is high time you______your membership dues．
A．paid
B．pay
C．will pay
D．to pay
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