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— Must they clean and tidy the classroom now?
— No, they      . It       after school in the afternoon.
A.mustn’t; must cleanB.needn’t; must clean
C.mustn’t; need be cleanedD.don’t have to; can be cleaned
D
must构成的一般疑问句通常否定回答时用needn’t或don’t have to,本题的最后一句是被动句,结构为be+过去分词,即be cleaned,故本题选D。
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