单项选择题

The meeting has been canceled. Ann _________ all that work.

A．need to do
B．need have
C．needn't have done
D．needed not to do
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单项选择题
The reason for the traffic accident was _________ one of the drivers had lost control of his car.
A．why
B．when
C．that
D．how
单项选择题
For the success of the project, the company should _________ the most of the opportunities at hand.
A．obtain
B．grasp
C．catch
D．make
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