Upon arriving home,I was surprised to find the paper I had had ___ was missing.

Upon arriving home,I was surprised to find the paper I had had ___ was missing.

题目
Upon arriving home,I was surprised to find the paper I had had ___ was missing.
为什么选prepared的形式啊
答案
had had是过去完成时 had+动词过去分词,表示完成时态所以用prepared
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