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she has become an expert at doing housework.
网校学员unr**在学习英语零基础直达大学六级【2月特惠班】时提出了此问题，已有1人帮助了TA。
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清醒季smile
同学你好，该知识点来自沪江网校《英语零基础直达大学六级【2月特惠班】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。
同学你好~是系动词，at doing housework是定语。
expert后面习惯跟的是at/in/on doing sth，比如
He's an expert at getting his own way.
他在如何达到自己的目的方面很在行。
祝同学学习进步~
版权申明：知识和讨论来自课程：《英语零基础直达大学六级【2月特惠班】》的学员和老师，如果想了解更多，可以报名参加课程学习。所有知识讨论内容，版权归作者及沪江网校所有。
英语零基础直达大学六级【2月特惠班】
已有6人在本课程中发现了233个知识
已有191个知识得到了老师的回复
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