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46. He got excited at the news，________ I was calm.
A. when B. while C. because D. after
47. Shall Brown come and play computer games?
No，________ he has finished his homework.
A. when B. if C. unless D. once
48. Hardly had he arrived in Hongkong ________ she rang me up.
A. when B. than C. that D. and
49. ________ they heard the shout for help，they rushed out.
A. Immediately B. The moment C. The while D. All the above
50. ________，he never seems able to do the work beautifully.
A. Try as he may B. as he tries C. Try as does he D. As he does try
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