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双重否定句中,如果添加一个反义疑问句.疑问句用否定还是肯定.

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双重否定句中,如果添加一个反义疑问句.疑问句用否定还是肯定.
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答案和解析
视情况而定
I don't think he isn't at home,isn't he ?
She doesn't think he isn't at home,does she?