问题
选择题
The city of Qingdao has been working on building itself up as a city of sails ________ it successfully hosted the 2008 Olympics’ sailing program.
A.after
B.since
C.when
D.until
答案
答案:B
题目分析:考查连词。题意:自成功举办08奥运游泳项目以来,青岛一直致力于建设航海城。现在完成进行时has been working提示用since引导状语从句。故B项正确。