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Only when I left home to go to college ___ how much my mother had done for me.

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

A

解析试题分析:句意:只有当我离开家去上大学,我才意识到妈妈为我做了多少事情。这句话用only+时间状语从句,放在句首,后面的主句用部分倒装,助动词提前,因为realize这个动作,就是发生在when I left home to go to college,所以用一般过去时,所以选A。
考点:考查倒装句

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