题目内容

5．________ with some research materials，he decided on three possible approaches in his experiment．（　　）
A．PreparingB．PreparedC．Having preparedD．Prepare

分析 准备好了一些研究材料，在他的实验中，他选定了三种可能的方法．

解答 答案：B
此处在句中作状语，尽管动词prepare与其逻辑主语he之间是主动关系，但是由于此处的过去分词prepared来源于系表结构be prepared with"准备好"，故此应使用过去分词形式，故选B．

点评 做本题时，需要了解有些过去分词因来源于系表结构，作状语时不表被动而表主动；这样的过去分词及短语常见的有：lost （迷路）； seated （坐）； hidden （躲）； stationed （驻扎）； lost/absorbed in （沉溺于）； born （出身于）； dressed in （穿着）； tired of （厌烦）等．

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