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

試題分析：句意是：不知道怎么解決這個難的物理問題，他向老師求助。因為he和know是主動關(guān)系，用現(xiàn)在分詞做狀語，否定式是在現(xiàn)在分詞前面加not，選B。
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