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

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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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Themanagerofthehotelrequeststhattheirguests______after11:00P.M.A、not