单项选择题

—Do you mind if I smoke here — ______.

A．Sure. Go ahead
B．No. Go ahead
C．Yes. Please
D．Yes. I don't
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单项选择题
He must have attended the meeting yesterday, ______ he
A．didn't
B．mustn't
C．needn't
D．hadn't
单项选择题
Please ______ why you're so late , said his girlfriend.
A．excuse
B．explain
C．apologize
D．tell
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