Walter offered us a lift when he was leaving the office, but our work , we refused his offer.
A. not finishing
B. had not been finished
C. not having finished
D. not finished
网友回答
A. not finishing
B. had not been finished
C. not having finished
(答案→)D. not finished
解析：在这里，our work处在逗号位置，作整个句子的原因状语，这里应填非谓语动词。work和finish存在逻辑上的被动关系，所以应该用过去分词，故选D。