【題目】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】

考查動詞不定式的完成式作賓語。句意：中國科學家聲稱已經(jīng)發(fā)現(xiàn)了治療這種疾病的方法。固定搭配：claim to do sth.“聲稱------”，此處動詞不定式的動作discover先于claim的動作，所以用動詞不定式的完成式，故答案為C。

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