Only when I left my parents for Italy how much I loved them.A. I realizedB. I had realize

问题补充：

Only when I left my parents for Italy how much I loved them.

A. I realized

B. I had realized

C. had I realized

D. did I realize

答案：

A. I realized

B. I had realized

C. had I realized

(答案→)D. did I realize

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