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    【题目】The Chinese scientists claimed _______ a cure for the disease．

    A. having discovered B. discovering

    C. to have discovered D. that they discover

    【答案】C

    【解析】

    考查动词不定式的完成式作宾语。句意：中国科学家声称已经发现了治疗这种疾病的方法。固定搭配：claim to do sth.“声称------”，此处动词不定式的动作discover先于claim的动作，所以用动词不定式的完成式，故答案为C。

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