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    【题目】The scientists have already the secret of the universe.

    A. found B. looked for C. discovered D. seen

    【答案】C

    【解析】句意：科学家们已经发现了宇宙的奥秘。考查动词辨析题。A. found寻找；B. looked for查找，强调过程；C. discovered发现（本已存在的）；D. seen看见。根据句意和语境，可知ABD三个选项意思都与句意不符，故选C。

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