单项选择题

I ______ from him since he left.

A．didn't hear
B．haven't heated
C．haven't heard
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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
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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