单项选择题

It is said that this medicine is ______ against fever.

A．economic
B．easy
C．expensive
D．effective
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单项选择题
If you don't ______ smoking and drinking, she will break up with you.
A．gave up
B．give up
C．had given up
D．will give up
单项选择题
Seldom ______ my neighbor in such good mood(心情) since I moved here.
A．I saw
B．I have seen
C．have I seen
D．Do I seen
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