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高考的英语题谢谢~~Upon arriving home,I was surprised to find the pap

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高考的英语题谢谢~~
Upon arriving home,I was surprised to find the paper I had had ______ was missing.
A.to be prepared
B.to prepare
C.preparing
D.prepared
给讲一下,谢谢
选D have sth done表示某物被...sth与主语为被动关系,句中为一个宾语从句套一个定语从句,paper在句中作宾语,所以省去了that或which,还原为 I had the paper prepared,又加了个had done表示过去完成时, I had had the paper prepared,我之前准备好的纸.