(4分)I failed in the last exam and only then ___ the importance of studies. A. I realized B. I had realized C. had I realized D. did I realize

(4分)I failed in the last exam and only then ___ the importance of studies.
A. I realized
B. I had realized
C. had I realized
D. did I realize

出自：兰州大学-大学英语3

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