问题补充:
Only when I checked the paper once more there was a mistake.
A. I realized
B. did I realize
C. I had realized
D. had I realized
答案:
A. I realized
(答案→)B. did I realize
C. I had realized
D. had I realized
解析:句意:只有我再次检查试卷时才意识到有一个错误出现了。这是倒装句,Only+状语从句放在句首时,主句用部分倒装。检查时发现的错误,检查和意识到几乎同时发生所以用过去式,故选B。
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