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Mary has two brothers,________ A.is she B.does she C is not

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Mary has two brothers,________ A.is she B.does she C is not she D does not she
为什么选D
Mary has two brothers,________ A.is she B.does she C is not
这边是反义疑问句
前面是肯定 后面就要用否定 排除 A和B
又因为has是动词have的三单形式 所以反义疑问句用助动词does 排除C
所以选择 D does not she =doesn't she
再问: 为什么用does
再答: 因为has是动词have的三单形式 所以反义疑问句用助动词does