单项选择题

The professor's speech left a deep impression ______ the audience.

A．at
B．with
C．for
D．on
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单项选择题
The doctor insisted that the patient ______ at once.
A．operated on
B．should be operated on
C．operate on
D．would be operated on
单项选择题
If you ______ here for a moment, the boss will come.
A．will wait
B．wait
C．are going to wait
D．are waiting
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