单项选择题

He said, "We ______ be proud of working hard. We mustn't be lazy. "

A. must



B. needn't
C. may



D. can't
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单项选择题
—The blue skirt looks very nice. May I ______ —Yes, please.
A. try them on


B. try it on
C. take them off


D. take it off
单项选择题
—Do you mind if I smoke —______
A. Why not
B. Yes, help yourself.
C. Go ahead.
D. Yes, but you'd better not.
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