what is black when it is clean and white when it is dirty?
什么东西黑色的时候是干净的,脏的时候是白的?
解答 Blackboard 黑板
趣味英语问答（1）what is black when it is clean and white when it is
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1.What is black when it is clean and white when it is dirty?
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【what is clean when it black ,and white when it is dirty.
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What is black when it`s chean and white when it`s dirty?
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It is clean when it is black.
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