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选择是不是选A?4.The manager offered us a lift when he was leaving

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选择是不是选A?
4.The manager offered us a lift when he was leaving the office,but our work _____,we didn’t accept the offer.
  A.not being finished B.has not been finished C.not having finished D.was not finished
A.but 是连接前后两个并列句的,前一句很清楚,后一句是but后面的所有词句,可以把它视为整体,它的主体是we didn't accept the offer.因此,空格只有一个逗号与下文连接,只能是非谓语动词,work 与finish是被动关系,故选A.分词前有逻辑主语,这也叫独立结构,作状语,表示原因或伴随情况.