单项选择题

You ______ her in her office last Friday; she's been out of town for two weeks.

A. needn't have seen
B. might have seen
C. must have seen
D. can't have seen
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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
That battle is of great significance when viewed in the ______ of the progress of the war.
A. notion
B. perspective
C. concept
D. outlook
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