同义句转换: He could walk when he was thirteen months old. He could walk _____ _____ _____ _____.

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同义句转换: He could walk when he was thirteen months old. He could walk _____ _____ _____ _____.
同义句转换: He could walk when he was thirteen months old. He could walk _____ _____ _____ _____.

同义句转换: He could walk when he was thirteen months old. He could walk _____ _____ _____ _____.
He could walk when he was thirteen months old.
=He could walk 【at thirteen months old】.