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

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

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问题 Only when I began to do it ______ that I had made a mistake.
选项 A、I realized
B、I had realized
C、did I realize
D、would I realize
答案C
解析 倒装句。only起始的句子主谓要倒装。题干为过去时，选择过去时的倒装：did I realize。只有开始做的时候才会意识到自己犯了错。
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