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、短信提醒原则二、不及物动词无-ed形式非谓语动词，及物动词有宾语时用-ing形式，无宾语时用-ed形式
例3. ____________ in the mountains for a week, the two students were finally saved by the local police.
A. Having lost B. Lost C. Being lost D. Losing
解析：lose为及物动词，现在后面没有宾语，所以用-ed形式，答案为B。
例4. __________, I really believe that I’d prefer not to make any change now.
A. Considered all the possibilities B. Taking all the possibilities into consideration
C. Taken all the possibilities into consideration D. Giving all the possibilities
解析：把。。。考虑进来结构为take sth into consideration，现在take后面有宾语all the possibilities，所以用-ing形式，答案为B。
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