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12. The fact ______ doctors recommend that children with hypertension drink coffee is surprising.
A. what B. is that C. that D. of
13. _______ is no reason for discharging her.
A. Because she was a few minutes late
B. Owing to a few minutes being late
C. The fact that she was a few minutes late
D. Being a few minutes late
14. I have no doubt ______ he will overcome all his difficulties.
A. whether B. when C. that D. if
15. The old gentleman never fails to help ______is in need of his help.
A. who B. whoever C. one D. whomever
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