【題目】Researchers claim ________ the first proof that getting a regular eight-hour sleep every night makes a real difference to our health.

A. findingB. having found

C. to findD. to have found

【答案】D

【解析】

考查非謂語(yǔ)動(dòng)詞。句意：研究人員稱，他們發(fā)現(xiàn)了第一個(gè)證據(jù)，證明每晚有規(guī)律的八小時(shí)睡眠對(duì)我們的健康有很大的影響。claim to do表示“聲稱做某事”，find發(fā)生在claim之前，應(yīng)該用不定式的完成式，故D項(xiàng)正確。

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