Not until I was standing on the edge of death how much I wanted to live.
A. I realized
B. did I realize
C. I had realized
D. had I realized
网友回答
A. I realized
(答案→)B. did I realize
C. I had realized
D. had I realized
解析：考查倒装结构.当not until 等否定性词语谓语句首时,主句采用部分倒装.句意:直到我站在死亡边缘时,我才知道我是多么想活着.叙述的是在某个时间发生的动作,故用过去时态,选D.