一道七年级英语题He has no brother and no sister.He __ have _

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一道七年级英语题
He has no brother and no sister.
He ______ have ________ brother or a sister.
给讲一下,谢谢

doesn`t,a
很显然这是一个否定句,句中没有be动词也没有情态动词,所以必须借助助动词does not=doesn`t（主语是第三人称用doesn`t,其他用don`t）,后面一个我想不用解释了.

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