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
It________be very cold here, even in May.
A．must
B．will
C．may
D．can
单项选择题
He was caught________in the examination.
A．deceiving
B．cheating
C．tricking
D．swindling
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