向大家请教两个英语句子,反义疑问句.1.Nobody is at home,______?A.is he B.isnlt he C.are they D.aren't they答案给的是C,为什不是A呢?2.He can't be a doctor,______ he?A.can B.can't C.is D.isn't答案给的是C,为什么不是A呢?

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