________that he made an obvious mistake，Jeff went on with his speech.
A．Not realizedB．Not realizing
C．Not to realizeD．Not to have realized
B

試題分析：考查分詞，名詞he和動詞realize是主謂關(guān)系，所以用現(xiàn)在分詞做狀語，句子意思“沒有意識到他明顯的錯誤，杰夫繼續(xù)他的演講”
點評：做此類題時，首先判斷名詞和動詞的關(guān)系，如果名詞和動詞是主謂關(guān)系，那么用動名詞做狀語；如果是動賓關(guān)系，則用過去分詞作狀語
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