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    精英家教网 > 高中英语 > 题目详情
        how to work out the difficult physics problem ,he asked the teacher for help .
    A．Not to knowB．Not knowingC．Knowing notD．Not known
    B

    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。
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