高一英语tales of unexplained课件
1. My friend, who ___ on the International Olympic Committee all his life, is retiring next month. (2006浙江)
     A. served                 B. is serving 
     C. had served             D. has served
2. Although medical science ____control over several dangerous diseases, what worries us is that some of them are returning. (2006江苏)  
  A. achieved             B. has achieved    
  C. will achieve         D. had achieve3.
3.The construction of the two new railway lines _______by now. (2006陕西)
A. has been completed    B. have been completed
C. has completed         D. have completed