互動封閉仿真課堂
1、智能交互 2、電子板書式視頻教學 3、在線互動問答 4、封閉課堂啟發(fā)式教學方式
隨堂測試、知識梳理、易錯點揭示、總結啟迪智能錯題本
聽課中的錯題能自動加入錯題本，課后可方便復習及導出錯題本升級服務
在線答疑、課后同類題練習、講義下載、短信提醒五、but的用法:
but用作關系代詞, 其意思相當于who/that…not…, "沒有……不……", 如：
1.There is not one of us but wishes to help you.
2.There is no tree but bears some fruit.
3.There are very few but admire his talents.
Ⅲ. 關系副詞引導的定語從句:
When 指時間，在定語從句中作時間狀語。其先行詞是表時間的名詞(如：time, day, week, tear, month, etc.)
1. He came last night when I was out.
2. We will put off the picnic until next week, when the weather would be better.
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