how to do the homework, I went to ask my teacher for help.
A．Not to knowB．Not knowing 　C．Knowing notD．Not known
B
考查非謂語動詞。分詞的否定式應在其前面加not,主語I 與動詞know 之間是主動關系，所以用現(xiàn)在分詞。故選B。
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