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、短信提醒二、which: 指物;在定语从句中作主语，宾语，表语，定语。如：
1. The book which/that was on the desk was bought by my father.(主语)
2. The book (which/that) I bought yesterday is very interesting.(宾语)
3. The factory in which his father works is far from here.
4. He was proud, which his brother never was. (表语)
5. Tom spent four years in college, during which time he learned French.(定语)
6. He may be late, in which case we ought to wait for him.
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