During that time the districts that stayed closed longest forced all or some of their children to learn remotely for twice as long as schools in Ireland.
这里for是什么成分?去掉可以嘛?
Indians are the world's biggest book worms, reading on average 10.7 hours a week, twice as long as Americans, according to a new survey.
这里为啥没有for?
《高考英语备考1号·速效编》
《高考英语备考1号·写作编》
《高中英语晨读晚记》
《高中英语错题笔记》
《零起点考大学英语》