Only when I began to do it ____ that I had made a mistake.A I realized B I had realize

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Only when I began to do it ____ that I had made a mistake.

A I realized B I had realized C did I realize D would I realize

请帮忙给出正确答案和分析,谢谢!

热搜:关于氨基酸代谢错误的论述是_________。