Nowadays, trains ________ more and more quickly.    

A. traveled                
B. travel    
C. have traveled            
D. are traveling
B
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科目：初中英語 來源：同步題 題型：單選題

Nowadays,trains      _  more and more quickly.    
[     ]
A. traveled                
B. travel    
C. have traveled            
D. are traveling

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