单项选择题

______was pointed above, this substance can be used as a substitute.

A．It
B．That
C．What
D．As
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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
单项选择题
The pain will go away ______.
A．by and by
B．by any chance
C．all over
D．at present
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