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16.The thread of my kite broke and it flew away. I had told you it would easily break ________it was the weakest.
A. when B. where C. unless D. since
17.The crowd started cheering ______ he rose to speak.
A. as B. since C. till D. where
18.I had worked here ______ you came here. But I shall leave for England ______.
A. before long， before long B. before long； long before C. long before， before long D. long before； long before
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