问题
选择题
_____ on May Day, the Shanghai Expo has attracted tens of thousands of visitors around the world every day．
A．Having opened
B．Opened
C．Opening
D．To open
答案
答案：B
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_____ on May Day, the Shanghai Expo has attracted tens of thousands of visitors around the world every day．
A．Having opened
B．Opened
C．Opening
D．To open
答案：B