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He often goes to see his grandparents ____ he has time on weekends.

A. but  
B. although  
C. until  
D. when
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科目：初中英語 來源：同步題 題型：單選題

He often goes to see his grandparents ____ he has time on weekends.
[     ]
A. but  
B. although  
C. until  
D. when

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