互动封闭仿真课堂
1、智能交互 2、电子板书式视频教学 3、在线互动问答 4、封闭课堂启发式教学方式
随堂测试、知识梳理、易错点揭示、总结启迪智能错题本
听课中的错题能自动加入错题本,课后可方便复习及导出错题本升级服务
在线答疑、课后同类题练习、讲义下载、短信提醒sb spends time (money) in [on] doing sth 某人在做某事方面花多少钱
it takes sb time (money) to do sth = it takes time (money) for sb to do sth 做某事花某人多少时间或钱
sth takes sb time (money) to do 某事花某人多少时间或钱去做
sb takes time (moeny) to do 某人花多少时间或钱去做某事
(2) 用于以上意义时,cost 不能用于被动语态,take 通常不用于被动语态,而 spend 则可以用于被动语态。如:误:Thirty dollars was cost by the coat.误:Two hours was taken to do the work.正:Two hours was spent on the work. 做这工作花了两个小时。