单项选择题

Had he worked harder, he ______ the exams.

A．must have got through
B．would have got through
C．would get through
D．could get through
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单项选择题
An earthquake is a shaking of the ground ______ when masses of rock beneath the surface of the earth change position.
A．which occurring
B．it occurs
C．and therefore occurring
D．that occurs
单项选择题
He is the only person who can ______ in this case, because the other witnesses were killed mysteriously.
A．testify
B．charge
C．accuse
D．rectify
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