单项选择题

When I got to the airport, the plane______.

A．already took off
B．had already taken off
C．has already taken off
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单项选择题
That big room ______for meeting.
A．uses
B．is using
C．can be used
单项选择题
Neither Peter______ Jack works in this factory.
A．or
B．nor
C．either
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