B 第一个空格的主语是a survey 单数,所以加s,后面的主语是 three hours of out door exercise ,表时间、距离、价格、度量衡等的名词作主语时,谓语动词通常用单数.
A survey of the opinions of experts____that three hours of o
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one of three 原文是take one of three pills every three hours.问一