单项选择题

If you have any trouble, you can turn ______ him for help.

A．for
B．at
C．to
D．in
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单项选择题
That singer and dancer ______ on the stage this evening.
A．are to perform
B．is to perform
C．perform
D．performs
单项选择题
All the lights ______ before we left the office.
A．has been turned off
B．have turned
C．had been turned off
D．had turned off
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