单项选择题

We have studied for two hours. Let's stop ______.

A．have a rest
B．to have a rest
C．having a rest
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单项选择题
Mr. Young and Miss Liu from America.
A．both are
B．are both
C．are all
单项选择题
Tom is sitting there ______ and thinking over something.
A．quite
B．strong
C．quietly
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