his work he went back to work after supper.A. Having not finishedB. Not having finishedC.

问题补充：

his work, he went back to work after supper.

A. Having not finished

B. Not having finished

C. Not finished

D. Finishing not

答案：

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.