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、短信提醒关系代词作介词宾语:
关系代词在定语从句中用作介词宾语时, 介词可放于从句之首, 也可放于从句之末. 但以放于句首较为正式.(介词前置，必须注意不影响动词词组的含义。关系代词who 和 that 用作介词宾语时, 介词必须放在句末.)如:
1. This is the book for which you asked.
=This is the book (that/which) you asked for.
2.Do you know the person with whom I shook hands?= Do you know the person (whom/who/that) I shook hands with?
3. The beginning of agriculture was a big step in human progress with which nothing could compare until our information age.
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