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、短信提醒定语从句全掌握
注意：先行词为"时间名词"，可用when引导定语从句，when在定语从句中作状语;还可以用which或that 引导，which或that在从句中作主语或宾语。
比较: 1.I still remember the day when /on which my brother joined the army.(作状语)
Next month, when you will be in your hometown, is just around the corner.
2. I still remember the days which/that we spent together. (作宾语)
Next winter which/that you'll spend in Harbin, I'm sure, will be exciting.
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