单项选择题

We are told that the order has not yet come, so we have nothing to do now but ______.

A．wait
B．to wait
C．to be waiting
D．waiting
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单项选择题
The experiment is not satisfactory and its data is doubtful; we'll have to do it ______ time.
A．second
B．the second
C．a second
D．this second
单项选择题
Peter ______ the driver's test, but he was not calm enough in the last minutes.
A．can have passed
B．might have passed
C．ought to have passed
D．must have passed
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