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Walter offered us a lift when he was leaving the office,but

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Walter offered us a lift when he was leaving the office,but our work( ),we refused the offer
A.not finishing B.had not been finished C.not having finished D.not being finished
该题正确答案应选D,说明其他几项为什么不对,
Walter offered us a lift when he was leaving the office,but
our work not being 叫做 独立主格结构,这里做状语,表示原因,相当于 because our work was not finished
A,C 用的是主动式,显然不对.
B 似乎对,但是两个并列句中间不能这么用逗号隔开.如果在we 前面加一个so就对了.