单项选择题

The students______their papers by the end of the week.

A．have finished
B．will be finishing
C．will have finished
D．have been finishing
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单项选择题
He leaned______the wall when he felt tired.
A．to
B．against
C．from
D．towards
单项选择题
There is something wrong with this printer, it needs ______.
A．to repair
B．repairing
C．repaired
D．repair
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