B
句译为：一项由专家发表的研究显示,每周三个小时的户外锻炼有益身体健康.
A survey 为单数用三单Shows
three hours of outdoor exercise a week只一个整体的事件,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