The city of Qingdao has been working on building itself up as a city of sails it successf

发布时间：2020-08-17 07:51:34

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

网友回答

A. after
(答案→)B. since
C. when
D. until
解析：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。
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