______ how to operate a washing machine,I had to ask my wife to show me the correct proceduresA.Not known B.Not to know C.Not knowing D.Having not known

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______howtooperateawashingmachine,IhadtoaskmywifetoshowmethecorrectproceduresA.NotknownB.NottoknowC.

______ how to operate a washing machine,I had to ask my wife to show me the correct proceduresA.Not known B.Not to know C.Not knowing D.Having not known
______ how to operate a washing machine,I had to ask my wife to show me the correct procedures
A.Not known B.Not to know
C.Not knowing D.Having not known

______ how to operate a washing machine,I had to ask my wife to show me the correct proceduresA.Not known B.Not to know C.Not knowing D.Having not known
c

选 C
这里是考察分词短语做状语的用法。
动名词/现在分词表示主动和正在进行
过去分词表被动和完成
动词不定式表主动和将来
这里句子的主语是I，也是分词短语的逻辑主语，所以不用过去分词。
其次，因为不知道是现在不知道，而不是未来不知道，所以不用不定式。
至于D选项的否定形式应该是Not having known，not位于分词前。

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