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

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

题型:不详难度:来源:
    how to work out the difficult physics problem ,he asked the teacher for help .
A.Not to knowB.Not knowingC.Knowing notD.Not known

答案
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。
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