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What is black when it's clean and white when it's dirty?

What is black when it's clean and white when it's dirty?

时间:2017-03-07 00:50:43 栏目:英语谜语 来源:未知 作者:我爱莉莉
导读:What is black when it's clean and white when it's dirty?
What is black when it's clean and white when it's dirty?

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