互动封闭仿真课堂1、智能交互 2、电子板书式视频教学 3、5分钟一次互动问答 4、封闭课堂
12. The Smiths ________ sending emails ________ letters, because it is faster.
A. prefer, to writing B. prefer, write C. prefers, to writing D. prefers, to write
13. Jim’s brother has several pairs of jeans, but he prefers the black______.
A. jean B. jeans C. pair D. pairs
14. I have a new idea. Let’s _________.
A. try out it B. try it out C. try them out D. try out them
15. –Which hair band do you like best, madam? –I can’t decide now. I really don’t know _______.
A. to choose which one B. choose which one C. which one to choose D. which one I should choose it