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3. Jasmine was holidaying with her family in a wildlife park ____ she was bitten on the leg by a lion.
A. when B. while C. since D. once
4. It is said in Australia there is more land than the govern- ment knows ____. (NMET 2002)
A. it what to do with B. what to do it with
C. what to do with it D. to do what with it
5. Roses need special care ___they can live through winter.
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