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题目内容
（兰州大学大学英语（3））
12.
(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
参考答案