单项选择题

I have ______ gone over my lessons, but he hasn't ______.

A．already,already
B．already,yet
C．yet,already
D．yet,yet
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单项选择题
It's a long time since he left his hometown, ______
A．didn't he
B．hadn't he
C．wasn't it
D．isn't it
单项选择题
The celebration has been called ______ because of the bad weather.
A．for
B．off
C．up
D．at
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