选A 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也就是说 我姐姐在这栋房子动工之后离开.故选after 第一个it指这栋房子 第二个it指盖这栋房子这件事
新概念2 Lesson23Work on it had before my sister left.My sister
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