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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单项选择题
He took the medicine, but it didn't have any______.
A．answer
B．cause
C．effect
D．work
单项选择题
Robots have already______ human tasks in the industrial field.
A．taken on
B．taken out
C．taken up
D．taken over
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