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“介词 关系代词”可以引导限制性定语从句，也可以引导非限制性定语从句。这个结构中的介词可以是in, on, about, from, for, with, to, at, of, without等，关系代词只可用whom或which,不可用that，且介词后面的关系词不能省略。另外某些在从句中充当时间，地点或原因状语的“介词 关系代词” 结构可以同关系副词when和where互换。
eg: This is the house in which my mum and I used to live.
This is the house where (that) my mum and I used to live.
I'll remember the days in which you stayed with me.
I'll remember the days when (that) you stayed with me.
Is this the reason why (that) she was late?
Is this the reason for which she was late?
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