his work, he went back to work after supper.
A. Having not finished
B. Not having finished
C. Not finished
D. Finishing not
网友回答
A. Having not finished
(答案→)B. Not having finished
C. Not finished
D. Finishing not
解析：本题考查现在分词的完成式，答案为B。非谓语结构的否定，都是在非谓语结构前加not.