单项选择题

Don't you think it is time you ______smoking

A．give up
B．gave up
C．would give up.
D．should give up
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单项选择题
The pain will go away ______.
A．by and by
B．by any chance
C．all over
D．at present
单项选择题
The old man walked slowly, stopping frequently ______.
A．on rest
B．at rest
C．resting
D．to rest
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