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

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

出自：兰州财经大学-大学英语

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