问题
选择题
_____ better in 2010 World Expo is the duty of every citizen in Shanghai. [ ]
A. Being served
B. Serving
C. Serve
D. Having served
答案
答案：B
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_____ better in 2010 World Expo is the duty of every citizen in Shanghai. [ ]
A. Being served
B. Serving
C. Serve
D. Having served
答案：B