单项选择题

He took________smoking and drinking when he was very young.

A．in
B．on
C．off
D．to
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单项选择题
According to the doctors, if there were no________, they would probably cure the disease.
A．complexities
B．completions
C．compliances
D．complications
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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