单项选择题

All______to Hong Kong were delayed because of bad weather．

A．fly
B．flights
C．flyings
D．flies
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单项选择题
The fact______exercise is good for health is known to all．
A．which
B．what
C．that
D．it
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
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