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
It is______ that over one million Americans now live below the poverty line.
A．judged
B．estimated
C．calculated
D．considered
单项选择题
I can't find the recorder in the room. It ______by somebody.
A．must have taken
B．may have taken
C．may have been taken
D．should have been taken
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