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猜一猜,写一写,画一画.1．It is clean when it is black.It is dirty when
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英语专家请进!一、猜一猜.1.What is clean when it is black and dirty when
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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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It is clean when it is black.
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