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
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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
单项选择题
You can stay in my room ______ you promise not to use the computer.
A．so far as
B．except
C．unless
D．provided
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