单项选择题

The students ______ their papers by the end of this month.

A．have finished
B．will be finishing
C．will have finished
D．have been finishing
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单项选择题
She gave up her job as a nurse because she found the children too difficult ______.
A．look after
B．to look after
C．looking after
D．be looked
单项选择题
He was very sorry ______ her at the airport.
A．not to meet
B．to not meet
C．to have not met
D．not to have met
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