单项选择题

The professor gave ______ instructions for carrying out the research project.

A．explicit
B．formidable
C．afflictive
D．dominant
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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
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
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