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l ___go there this morning,so l stayed at home A.didn't need

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l ___go there this morning,so l stayed at home A.didn't need to B.didn't need C.needn't to 选哪个?为什么
答案:A
解释:如果使用need to do sth,则表明need是实意动词而不是情态动词.
因为情态动词其后直接加动词原形,所以必须说成need do sth.
既然need是实意动词,则其做谓语时句子的否定句必须借助于助动词don't, doesn't或didn't来变化,所以正确答案为didn't need to.