The researchers found clear and convincing evidence _________ happiness is the key when it comes to better health and longer lives.
A．whereB．whetherC．howD．that
D

試題分析：句意：研究人員發(fā)現(xiàn)清楚的令人信服的證據(jù)當說到健康和長壽的時候，快樂是關鍵。這里是that連接同位語從句，說明evidence的內容，選D。
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