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—Must I come back before supper, mum?
—No, you        .
A.can’tB.mustn’tC.don’tD.needn’t
D
考查must的否定回答.句意:妈妈,我必须在晚饭前回来吗?_不,你不必.以must开头的一般疑问句,其否定性回答要借助于needn’t或don’t have to.结合所给选项,可知选D.
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