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、短信提醒原则十、 非谓语动词的否定原则是在非谓语动词前加not，有not to do, not doing, not having done, not to have done几种形式
例23______that he was in great danger, Eric walked deeper into the forest.
A. Not realized B. Not to realize C. Not realizing D. Not to have realized
解析： 本题考查doing的否定形式not doing，答案为 C。
例24. What worried him most was ______ to visit his sick child.
A. his being not allowed B. his not being allowed
C. his not allowing D. having not been allowed
解析：本题考查being done的否定形式not being done; his 为not being done的逻辑主语，所以答
案为B。
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