how to do the homework,I went to ask my teacher for help.A.Not to know   B.Not knowing  C.Knowing not   D.Not known 选项 原因

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how to do the homework,I went to ask my teacher for help.A.Not to know   B.Not knowing  C.Knowing not   D.Not known 选项 原因
how to do the homework,I went to ask my teacher for help.
A.Not to know   B.Not knowing  C.Knowing not   D.Not known
选项 原因

how to do the homework,I went to ask my teacher for help.A.Not to know   B.Not knowing  C.Knowing not   D.Not known 选项 原因
选B,意思是不知道怎么做家庭作业,我去找老师帮忙,这里是非谓语现在分词作状语的否定式,not在前,A不定时一般表将来怎么样,D是过去分词,表示被知道,逻辑主语和意思都不对.

B. Not knowing  
这是分词短语作状语表原因

分词的否定式是在最前面加Not


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