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    【题目】He __________ everywhere for materials and finally his efforts paid off. The medicine __________ to be very effective.

    A. looked; was proved B. explored; was proved

    C. sought; has proved D. hunted; was proving

    【答案】C

    【解析】考查动词辨析。句意：他四处寻找材料，终于他的努力得到回报，那个药已经被证明是非常有效的。look看；explore勘查，探测；hunt打猎；search侧重“搜寻、搜索”的意思，后面直接跟名词prove用作连系动词，意思“结果是”、“证明是”，根据语境应该已经得到证明了。故选C。

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