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so that: Ask her to hurry up with the letters so that I can sign them.
让她快点把信打好，以便我能签字。
引导时间状语从句的连词：
when: Don't get excited when you talk. 讲话时别激动。
while: We must strike while the iron is hot. 我们要趁热打铁。
as: He smiled as he passed. 他经过时笑了笑。
before: It will be five years before we meet again. 要五年后咱们才能再相见。
after: I'll tell them after you leave. 我将在你走后告诉他们。
until, till: I propose waiting till the police get here. 我建议等警察来了再说。
since: How long is it since you came to London? 你到伦敦有多久了?
whenever: Whenever it is possible, they play outside. 一有机会他们就到外面玩耍。
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