Only when I graduated from the high school how much time I had wasted.A. I realized B. I had realize

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【题目】Only when I graduated from the high school ______ how much time I had wasted.

A. I realized B. I had realized

C. did I realize D. had I realized

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【答案】C

【解析】

试题分析：考察倒装。Only引导的状语从句，主句要部分倒装。文意是当我从学校毕业的时候我才意识到有多少时间虚度了。