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.
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