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who, whom, whose:
who: 主格, 在从句中作主语，在口语或非正式用法中作宾语; 只可指人
whom: 宾格，在从句中作宾语; 只可指人
whose: 属格，在从句中作定语，可指人也可指物。
1.I like the students who/that work hard. (主语)
2.All who heard the story were amazed. (代词如he, they, any, those, all, one等后多用who.)
3.Chaplin, for whom life had once been very hard, was a success as an actor. (宾语)
4.He's a man from whom we should learn. = He's a man (whom/who/that) we should learn from.
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