标题: 请教贴！！！！关于un前缀的用法 [打印本页] 作者: summerway 时间: 2012-8-7 22:10 标题: 请教贴！！！！关于un前缀的用法 如题，un-和not ...有区别吗？那个更好呢？ 63. (27740-!-item-!-188;#058&003625) D B
Compared to those who do not, running three days a week saves an average of 14.1 percent on health-care costs each year in the United States.
(A) Compared to those who do not, running three days a week saves (B) Compared with nonrunners, people who run three days a week save (C) Compared to not running, those running for three days a week save (D) When compared with those who do not, people running three days a week save (E) When compared to nonrunners, running three days a week saves