work on it had begun before my sister left.这句话的主语是倒装句吗?
问题描述：
work on it had begun before my sister left.这句话的主语是倒装句吗?
答
Work on it had begun before my sister left.这栋房子在我姐姐离开之前就已动工了.
Work在这儿是名词,意思是“工作”on it---介词短语作后置定语修饰work;
had begun 谓语动词,before my sister left时间状语从句.