单项选择题

Water always ______ steam when boiled.

A．gives out
B．gives up
C．gives off
D．gives in
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单项选择题
Your sister used to visit you quite often, ______
A．isn't she
B．use not she
C．wasn't she
D．didn't she
单项选择题
Two hundred dollars ______ a large sum of money to the old man.
A．is
B．is to be
C．are
D．are to be
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