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
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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
单项选择题
No one would imagine that that city was just a night' s journey from here. It seemed as though ______ in another world.
A．it being of
B．it were
C．it was
D．it to be
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