问题
选择题
I failed in the final exam last term. Only then ____the importance of studies. [ ]
A. I realized
B. I had realized
C. had I realized
D. did I realize
答案
答案：D
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I failed in the final exam last term. Only then ____the importance of studies. [ ]
A. I realized
B. I had realized
C. had I realized
D. did I realize
答案：D