问题补充:
. -- I go out to play now, mum?
--No, you . You should do your homework first.
A. Must, mustn’t
B. Might, wouldn’t
C. Need, mustn’t
D. May, had better not
答案:
A. Must, mustn’t
B. Might, wouldn’t
C. Need, mustn’t
(答案→)D. May, had better not
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