She didn’t help her mother do any housework until she was fifteen同义句
这有两个空 help her mother do any housework 这有一个空 she was fifteen
人气：207 ℃ 时间：2019-08-20 13:40:21
解答
=She 【started to 】help her mother do some housework 【after】 she was fifteen.after换成 when行不可以。
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