()Your sister ______ round face.1.don't have 2.doesn't have 3.doesn't has顺便说明为什么

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()Your sister ______ round face.1.don't have 2.doesn't have 3.doesn't has顺便说明为什么

()Your sister ______ round face.1.don't have 2.doesn't have 3.doesn't has顺便说明为什么
()Your sister ______ round face.1.don't have 2.doesn't have 3.doesn't has
顺便说明为什么

()Your sister ______ round face.1.don't have 2.doesn't have 3.doesn't has顺便说明为什么
2.doesn't have
主语第三人称单数,同时,have拥有,实意动词否定助动词提前.

don't have

2 主语单三,用does,所以后面的动词用原形have

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2,your sister,显然是第三人称,本来要用has ,但是否定的时候已经把谓语动词第三人称转移到does上了,所以has 要变回have,doesn't have=hasn't

2.doesn't have
肯定句的时候用have的三单形式has,否定句的时候应加助动词don't或三单形式doesn't, 因为句子前面已经使用了三单形式doesn't,所以have就变成动词原形。