The student you considered ______ hardest failed to pass the important examination.     

A. to have studied  
B. having studied  
C. to study  
D. studying
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科目：高中英語 來源：同步題 題型：單選題

The student you considered ______hardest failed to pass the important examination.     
[     ]
A. to have studied  
B. having studied  
C. to study  
D. studying

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