单项选择题

She came into the room while they ______ television.

A．have watched
B．have been watching
C．were watching
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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
单项选择题
Tell Mr. Wang to go to Mr. Li's office when you ______ him.
A．saw
B．will see
C．see
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