问题补充:
I failed again in the examination and only thenhow much time I had wasted.
A. I realized
B. I had realized
C. did I realize
D. had I realized
答案:
A. I realized
B. I had realized
(答案→)C. did I realize
D. had I realized
解析:考查倒装。only+状语放在句首时,句子要部分倒装。