________ with some research materials, he decided on three possible approaches i
题型：不详难度：来源：
________ with some research materials, he decided on three possible approaches in his experiment.| A．Preparing | B．Prepared | C．Having prepared | D．Prepare |
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答案
| B |
解析
试题分析：考查过去分词做状语：句意：准备好了研究材料，他决定实验的三个可能的方法。Be prepared with准备好了，所以这里用过去分词做状语，表示状态，如果是prepare表示动作“准备”，选B。 |
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