单项选择题

The electric fan does not work because of the ______ of service.

A．pause
B．break
C．interruption
D．breakdown
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单项选择题
Even if his letter ______ tomorrow, it ______ too late to do anything.
A．will arrive.., is
B．should arrive.., were
C．arrives.., will be
D．arrives.., would be
单项选择题
John's score on the test is the highest in the class; he ______ last night.
A．must study
B．should have studied
C．must have studied
D．is sure to study
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