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【題目】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】考查動詞辨析。句意：他四處尋找材料，終于他的努力得到回報，那個藥已經被證明是非常有效的。look看；explore勘查，探測；hunt打獵；search側重“搜尋、搜索”的意思，后面直接跟名詞prove用作連系動詞，意思“結果是”、“證明是”，根據語境應該已經得到證明了。故選C。

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