单项选择题

You should act ______ the advice of your doctor.

A．to
B．on
C．at
D．as
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单项选择题
Does it ______ much to have the bicycle repaired
A．pay
B．spend
C．cost
D．ask
单项选择题
This is a mistake which is typical ______ beginners.
A．for
B．of
C．to
D．with
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