英語單選,分詞類

英語單選,分詞類
Not realizing/realized that he made a mistake,Jeff went on with his speech.選哪個?ed還是ing?我覺得水ed好像錯了

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realizing
過去分詞不做主語這個不是做主語的問題吧，爲什麽不用realized？不好意思我錯了。是現在分詞作伴隨狀語不能用ed表示已經發生的事嗎？我這裡腦子好混亂Jeff went on with his speech, not realizing that he made a mistake.