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Work on it had begun before my sister left.
网校学员傍晚天**在学习英语零基础直达PETS三级/公共英语三级【年中特惠班】时提出了此问题，已有2人帮助了TA。
网校助教
echoco1234
同学你好，该知识点来自沪江网校《英语零基础直达PETS三级/公共英语三级【年中特惠班】》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~这句话的意思是：在我姐姐离开之前，工作已经开始了。before my sister left这是before引导的时间状语从句。对照一下中文意思，同学可以发现，要表达同样的中文意思，不可用after替换哦。
祝同学学习愉快~~
网校助教
echoco1234
同学你好，该知识点来自沪江网校《英语零基础直达PETS三级/公共英语三级【年中特惠班】》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~这句话的意思是：在我姐姐离开之前，工作已经开始了。before my sister left这是before引导的时间状语从句。对照一下中文意思，同学可以发现，要表达同样的中文意思，不可用after替换哦。
祝同学学习愉快~~
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英语零基础直达PETS三级/公共英语三级【年中特惠班】
已有20人在本课程中发现了1277个知识
已有1024个知识得到了老师的回复
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