题目内容

Only when I left my parents for America ____ how much I loved them

A.
I realized
B.
I had realized
C.
had I realized
D.
did I realize

D
考查倒装。Only+ when引导的时间状语从句放在句首时，主句要部分倒装，所以排除A,D；C项表示意识到我有多爱他们这一动作发生在left之前，不符合句意，所以选D。

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Only when I left my parents for America ____ how much I loved them

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