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) used to do sth. 过去常常……(现在已不如此)
We used to grow beautiful roses.
注意：否定句和疑问句有两种
You usedn’t to make that mistake.
She didn't use(d) to do it, did she?
You used to smoke a pipe, didn't you? / use(d) n't you?
(2) be / get / become used to n. / doing 习惯于
I have always been used to hard work.
He got used to living in the country.
(3) be used to do 被用来做……
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