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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 较易
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— 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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—Musttheycleanandtidytheclassr