摘要： -Let's go to the concert tonight, Michael! -Sorry, I . I have to help my mother with the housework. A. mustn't B. may not C. needn't D. can't
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— Let's go to the concert tonight, Michael!
— Sorry, I _____. I have to help my mother with the housework.
— Sorry, I _____. I have to help my mother with the housework.
[ ]
A. mustn't
B. may not
C. needn't
D. can't
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B. may not
C. needn't
D. can't