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
The professor asked a question, and David______a good answer.
A) put up with
B) stood up for
C) came up with
D) looked down upon
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