问题
选择题
Only when I lost the opportunity to take my first job ____ how important it was to me.
A. I realized B. I had realized C, had 
I realized D . did I realize
答案
答案：D
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Only when I lost the opportunity to take my first job ____ how important it was to me.
A. I realized B. I had realized C, had I realized D . did I realize
答案：D