Must 和Can't 的疑问

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Must 和Can't 的疑问
-Must I renew the magazine now?
-No,you_______.you ____that before the deadline.
a.mustn't should do b.needn't should have done
c.may not should do d.can't ,should have done
我想问一下为什么答案是D,must的问句不是以needn't回答吗?

mustn't 不可以,needn't 不必,should 应该从句子前后意思来看,答案是B

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