单项选择题

Today the police can watch cars ______ on roads by radar.

A．run
B．to run
C．running
D．to be run
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The doctor will not perform the operation ______ it is absolutely necessary.
A．so
B．if
C．for
D．unless
单项选择题
______ is well known, the key to success lies in hard work.
A．As
B．That
C．Which
D．What
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