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Hehasbecomeadoctor反义疑问句是hasn'the还是dosen'the,又为什么,怎么区分什么情况用have什么情况根据后面的

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He has become a doctor 反义疑问句是hasn't he 还是dosen't he ,又为什么,怎么区分什么情况用have什么情况根据后面的
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He cooks himself Doesn't he cook himself? He has become a doctor Hasn't he become a doctor? you have been a good friend to him Haven't you been a good friend to him?
麻烦采纳,谢谢!