I____(have) my breakfast before I went to school 请问横线上填什么

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I____(have)mybreakfastbeforeIwenttoschool请问横线上填什么I____(have)mybreakfastbeforeIwenttoschool请问横线上填什么I_

I____(have) my breakfast before I went to school 请问横线上填什么
I____(have) my breakfast before I went to school 请问横线上填什么

I____(have) my breakfast before I went to school 请问横线上填什么
i had had my breakfast

填入 had , 与后面的过去时态是并列的, 因此填入过去式