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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構(gòu)成的一般疑問句通常否定回答時(shí)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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