【題目】----Must they clean the classroom now?

----No, they ______.

A.cant B.neednt C.mustnt D.dont

【答案】B

【解析】

試題分析:句意:――他們必須現(xiàn)在打掃教室嗎?――不他們不必。A.can’t不能,表示能力;不可能,表示否定的推測(cè);B.needn’t不必;C.mustn’t不準(zhǔn),不允許,禁止;D.don’t不。must表示必須,mustnt不得,不準(zhǔn),不允許,neednt不必。因此,must的一般疑問(wèn)句作否定回答用neednt。故選B。

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