Only when you told me about it what a silly thing I had done.A. I realizedB. did I realiz

问题补充：

Only when you told me about it what a silly thing I had done.

A. I realized

B. did I realize

C. I did realize

D. did I realized

答案：

A. I realized

(答案→)B. did I realize

C. I did realize

D. did I realized

解析：这题考查倒装句的用法：Only +时间状语when you told me about it，主句要部分倒装，did置于主语前，谓语动词realize用原形，句意是：只有当我被告知一切，我才意识到我做了多么愚蠢的事。选B。