单项选择题

Be sure to write to us,______

A．will you
B．aren't you
C．can you
D．can't you
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单项选择题
—I'm sorry I stepped outside for a smoke. I was very tired. —There is no______for this while you are on duty.
A．reason
B．excuse
C．cause
D．explanation
单项选择题
No sooner______this talk than he was surrounded by the workers.
A．he finished
B．did he finish
C．had he finished
D．after he finished
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