单项选择题

I was really too busy with my homework and I couldn't help ______ housework.

A．doing
B．do
C．did
D．done
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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
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
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