Question

________ with some research materials, he decided on three possible approaches in his experiment.

A．Preparing

B．Prepared

C．Having prepared

D．Prepare

Answer 1

B

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。