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

試題分析：考查過去分詞做狀語：句意：準(zhǔn)備好了研究材料，他決定實(shí)驗(yàn)的三個可能的方法。Be prepared with準(zhǔn)備好了，所以這里用過去分詞做狀語，表示狀態(tài)，如果是prepare表示動作“準(zhǔn)備”，選B。
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