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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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
单项选择题
They talked as if they _______ friends for years.
A．were
B．have been
C．would be
D．had been
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