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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
同位語從句考查題。 研究者發(fā)現清晰、具有說服力的證據當提及健康長壽的生活時幸福是關鍵。 中心詞是evidence連接詞that在從句中只起連接作用不做成分，選D。
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