Upon arriving home, I was surprised to find the paper I had had _____ was missingA.to be preparedB.to prepareC.preparingD.prepared
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D解析考查have sth done“请人做，使…被做”词组，分析句子the paper后面是定语从句，两个had，一个是助动词，一个是使役动词，在定语从句中从当宾语的关系代词被省略，prepare和the paper是被动关系，选D，意为：一到家，我很惊讶的发现我准备好的文件不见了。