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  3. ______ what to do, he went to the old man for help.

______ what to do, he went to the old man for help.

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问题 ______ what to do, he went to the old man for help.
选项 A、Not knowing
B、Not know
C、Not to know
D、Not known
答案A
解析 主语he和动词know是主动关系，所以用现在分词。现在分词的否定是在分词前加not。  
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