Ben learned to walk when he was about one year old.对划线部分提问划线部分是when he was about one year oldWhen did Ben learn to walk?为什么用did?

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Ben learned to walk when he was about one year old.对划线部分提问划线部分是when he was about one year oldWhen did Ben learn to walk?为什么用did?
Ben learned to walk when he was about one year old.对划线部分提问
划线部分是when he was about one year old
When did Ben learn to walk?为什么用did?

Ben learned to walk when he was about one year old.对划线部分提问划线部分是when he was about one year oldWhen did Ben learn to walk?为什么用did?
When did Ben learn to walk?
因为原句的时间状语是was,所以疑问句也要用相同的时态

When did Ben learn to walk?因为过去的事,用过去式did