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
答案:D [考查非谓语动词。句意:我一到家就惊奇地发现我事先让人准备的文件不见了。(that/which)I had had prepared是定语从句,修饰先行词the paper,从句中含有一个have sth done 结构,表示“让别人做某事”。]