I failed in the final examination last term and only then ______ the importance of studies. A. I realized B. I had realized C. did I realize D. had I realized

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题目内容（中北大学-大学英语1）

I failed in the final examination last term and only then ______ the importance of studies.
A. I realized
B. I had realized
C. did I realize
D. had I realized

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