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