单项选择题

Three fourths of the homework ______ today.

A．has finished
B．has been finished
C．have finished
D．have been finished
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单项选择题
I'm wondering how he can manage to ______ such a difficult problem.
A．put up with
B．get along
C．deal with
D．take off
单项选择题
Turn off the light before you ______.
A．leave
B．left
C．had left
D．is leaving
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