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20. There is no doubt that the boxes were then put on a train for… 毫无疑问，这些箱子后来被装上了运往……的火车。
There is no doubt that she will keep her word.毫无疑问她会遵守诺言的.
There is no doubt that Taiwan belongs to China. 这是毫无疑问的,台湾属于中国。
There is no doubt that she is capable of the job.她能胜任这个工作,这是毫无疑问的.
21. After that, what happened to the Amber Room remains a mystery. 从那以后，琥珀屋的去处便成了一个谜。
it remains to be seen 尚待分晓
The fact remains to be proved.事实尚待证明
remain in呆在家里 remain out呆在外面, 留在户外
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