Two building workers got seriously wounded when the stadium _______.     

A. was built  
B. was being built  
C. built  
D. is being built
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科目：高中英語 來源：同步題 題型：單選題

Two building workers got seriously wounded when the stadium _______.     
[       ]
A. was built  
B. was being built  
C. built  
D. is being built

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