单项选择题

He left________ an important detail in his account.

A．off
B．over
C．behind
D．out
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单项选择题
The tsunami (海啸)_________over 160,000 people were killed was a terrible disaster for human beings.
A．of that
B．among which
C．during that
D．in which
单项选择题
By the time you arrive this evening,_________ for two hours.
A．I will study
B．I will have been studied
C．I had studied
D．I will have been studying
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