第一节  语法和词汇知识(共14小题；每小题1分，满分14分)

19. I was told that Rose said something really bad behind my back.. I felt __________ and upset.

       A. betraying                 B. betrays                    C. betrayed                  D. being betrayed

20. _________ to go to a key university, he works hard and is trying his best to improve his English.

       A. Being determined    B. Determined                    C. Having determined        D.To determine

21. I phoned him last night but he didn’t answer. He must have gone out, ___________?

       A. hasn’t he                 B. mustn’t he               C. wasn’t it                  D. didn’t he

22. Tom and I are good friends and what’s more, we ____________ roommates since we came to Changjun.

       A. have been               B. became                    C. have made                     D. were

23. The research is so designed that once__________ nothing can be done to change it.

       A. begins                            B. having begun          C. beginning                D. begun