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
网友回答
A. not finishing
B. 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。