单项选择题

September 10th is ______ Teacher's Day.

A．/
B．the
C．a
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单项选择题
She came into the room while they ______ television.
A．have watched
B．have been watching
C．were watching
单项选择题
I shall start the work ______ he comes. I don't know what to do fast.
A．after
B．until
C．unless
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