Walter offered us a lift when he was leaving the office, but our work ,we refused the offe

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 having been finished

A. not finishingB. had not been finishedC. not having finished(答案→)D. not having been finished解析：考查独立主格结构。首先排除B项；工作应当是被做，排除A、C两项；故选D项。

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