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        how to work out the difficult physics problem ,he asked the teacher for help .

    A．Not to know B．Not knowing C．Knowing not D．Not known 

    B

    解析试题分析：句意是：不知道怎么解决这个难的物理问题，他向老师求助。因为he和know是主动关系，用现在分词做状语，否定式是在现在分词前面加not，选B。
    考点：考查非谓语动词

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