题目内容
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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