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、短信提醒一. 单项选择：
A. is built B. was built C. is being built D. has built
19. — Where does he come from, could you tell me?
—Pardon?
—I asked where ________?
A. did he come from B. he came from
C. he comes from D. does he come from
20. — You look so young in red, Mrs. Yang.
— __________.
A. That’s all right B. Not at all C. Thank you D. I don’t mind
二. 用动词的适当形式填空：
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