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He could ride a bike to school when he was ten．(变同义句)
He could ride a bike to school ________ ________ ________ ________ ten．
答案：at,the,age,of
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题目内容
句型转换
He could ride a bike to school when he was ten．(变同义句)
He could ride a bike to school ________ ________ ________ ________ ten．