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1. The first use of atomic weapons was in 1945, and their power _______increased enormously ever since. (2004 上海，29)
A. is B. was C. has been D. had been
2. —You were out when I dropped in at your house.
—Oh, I ______for a friend from England at the airport. (2004 福建，21)
A. was waiting B. had waited
C. am waiting D. have waited
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