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4. I had just started back for the house to change my clothes _____ I heard the voices.
A. as B. after C. while D. when
5. The class went on with the story _____ they had left it before the holiday.
A. where B. which C. in which D. when
6. The company has a free long-distance telephone number _____ customers may call with any questions they have about its products.
A. although B. as C. even if D. so that
7. Is Mr. Smith in the office？
Yes，________ he is in charge of the office，he must be there.
A. since B. however C. whether D. for
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