互動封閉仿真課堂1、智能交互 2、電子板書式視頻教學 3、5分鐘一次互動問答 4、封閉課堂
22. Every possible means _____ to work out the problem, but it is too difficult for us.
A. is used B. are used
C. has been used D. have been used
23. The company has a free long-distance telephone number
______ customers may call with any questions they
have about its products.
A. so that B. although C. as D. even if
24. - How do you learn English so well?
- ______ it every day.
A. In speaking B. By speaking
C. With speaking D. On speaking
25.The engineer left the office angrily , _______ never to return again.
A. determines B. determining C. to determine D. determined