问题描述：
You haven't been to Beijing,have you?为什么回答是No,l haven't 不是Yes,l have
You haven't been to Beijing,have you?
为什么回答是No,l haven't
不是Yes,l have
You haven't been to Beijing,have you?
为什么回答是No,l haven't
不是Yes,l have
问题解答：
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