单项选择题

If you travel in a strange place, a tour ______ may save you a lot of time.

A．director ______
B．helper
C．guide
D．assistant
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单项选择题
It is said that this medicine is ______ against fever.
A．economic
B．easy
C．expensive
D．effective
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
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