Only when I left my parents for Italy how much I loved them.
A. I realize
B. I had realized
C. had I realized
D. did I realize
网友回答
A. I realize
B. I had realized
C. had I realized
(答案→)D. did I realize
解析：本题考查倒装结构和动词的时态。分析句子结构，“only+when状语从句”位于句首时，句子要使用倒装结构，可排除A与B两项。再根据主从句时态一致的原则故选D项，排除C项。要牢记倒装句中的一些固定结构。