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．a(chǎn)fterB．sinceC．whenD．until
B

試題分析：考查連詞。題意：自成功舉辦08奧運游泳項目以來，青島一直致力于建設(shè)航海城�，F(xiàn)在完成進行時has been working提示用since引導(dǎo)狀語從句。故B項正確。
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