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遇到一个长句,其中that在句中承担什么成分,起到什么作用,是否指代什么,搞不清楚,

来源:学生作业帮 编辑:作业帮 分类:英语作业 时间:2024/05/18 07:48:46
遇到一个长句,其中that在句中承担什么成分,起到什么作用,是否指代什么,搞不清楚,
Those who watched TV for less than 7 hours a day were also 50 percent more likely to develop memory loss than those who spent longer than that staring at the screen.请问句中that如何理解?
that是代词,指的是7 hours a day.
这里比较的两方是:Those who watched TV for less than 7 hours a day,those who spent longer than that.每天看电视少于7小时的人,和花时间比它(每天7小时)多的人.