单项选择题

It was not an easy job for the police to find out the murderer, because no ______ had been found yet.

A．hint
B．clue
C．trace
D．track
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单项选择题
The sudden drop in temperature has greatly ______ the crops.
A．affected
B．effected
C．influenced
D．destroyed
单项选择题
He's ______ enough to stand all the hardships.
A．tough
B．rough
C．crude
D．hoarse
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