问题
选择题
Only when I got here _________ that I had made a big mistake. [ ]
A. did I realize
B. I realized
C. I have realized
D. have I realized
答案
答案：A
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Only when I got here _________ that I had made a big mistake. [ ]
A. did I realize
B. I realized
C. I have realized
D. have I realized
答案：A