单项选择题

Water, when boiled, always ______ steam.

A．gives in
B．gives up
C．gives off
D．gives away
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单项选择题
Not only ______ study well,but also he is always ready to help others.
A．he does
B．he did
C．does he
D．did he
单项选择题
Next week they ______ in the factory for ten years.
A．will be
B．will have been
C．are
D．have been
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