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When he was five ,he started playing the piano .(改为同义句)He started playing the piano ______ ______ ______ ______ five.

题目详情
When he was five ,he started playing the piano .(改为同义句)
He started playing the piano ______ ______ ______ ______ five.
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答案和解析
He started playing the piano at the age of five.