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He started to learn the piano when he was seven改为同义句He started to learn the piano ____ ____ ____ _____seven四个空
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He started to learn the piano when he was seven改为同义句
He started to learn the piano ____ ____ ____ _____seven四个空
He started to learn the piano ____ ____ ____ _____seven四个空
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He started to learn the piano at the age of seven
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