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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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
单项选择题
—Do you mind if I use your English book—. I'm not using it now.
A．Yes, I do
B．Of course I do
C．Of course not
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