— 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構(gòu)成的一般疑問句通常否定回答時用needn’t或don’t have to,本題的最后一句是被動句,結(jié)構(gòu)為be+過去分詞,即be cleaned,故本題選D。
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