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
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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
单项选择题
He took the medicine, but it didn't have any______.
A．answer
B．cause
C．effect
D．work
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