摘要： they clean the classroom now? No, they .
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?Must they clean the classroom now?
?No, they ________.
A. can't
B. needn't
C. don't
D. mustn't
查看习题详情和答案>>— Must they clean and tidy the classroom now?
— No, they . It after school in the afternoon.
A. mustn’t; must clean B. needn’t; must clean
C. mustn’t; need be cleaned D. don’t have to; can be cleaned
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