______ what to do, he went to the manager for help.A、Not to knowB、Not knowingC

游客2023-09-23  19

问题 ______ what to do, he went to the manager for help.

选项 A、Not to know
B、Not knowing
C、Not having known
D、Having not known

答案 B

解析 本句中现在分词knowing作原因状语,其否定形式是在前面直接加not。例如:Not having received un answer, I decided to write another letter.(没有得到答复,我决定再写一封信。)故选B。
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