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A survey of the opinions of experts           that three hours of outdoor exercise a week is good for one’s health.
A. show                      B. shows                C. is shown

B

解析试题分析:句意:专家观点的调查表明在户外一周锻炼三个小时对健康有好处。主语是第三人称单数,和谓语动词之间事实主动关系,故选B。
考点:考查动词的第三人称单数的用法。

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