单项选择题

The sudden drop in temperature has greatly________the crops.

A．affected
B．effected
C．influenced
D．destroyed
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单项选择题
A．exceptB．unlessC．insteadD．but
A．except
B．unless
C．instead
D．but
单项选择题
He must have been very depressed when he heard the news,
A．mustn't he
B．haven't he
C．wasn't he
D．didn't he
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