We are very lucky to live in the           .

A. 21 centuries    
B. 21st centuries  
C. 21 century  
D. 21st century
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科目：初中英語 來源：同步題 題型：單選題

We are very lucky to live in the           .
[     ]
A. 21 centuries    
B. 21st centuries  
C. 21 century  
D. 21st century

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