单项选择题

The best solution to the problem can only be found by a process of trial and ______.

A．error
B．mistake
C．success
D．experiment
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单项选择题
If you take this medicine twice a day it should ______ your cold.
A．heal
B．cure
C．treat
D．recover
单项选择题
It was clear that the storm ______ his arrival by two hours.
A．retarded
B．retrieved
C．refrained
D．retreated
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