—         did you start to swim?
—When I was 7 yeas old.

A. What        
B. How soon        
C. How long    
D. When
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科目：初中英語 來源：同步題 題型：單選題

-         did you start to swim?
-When I was 7 yeas old.
[     ]
A. What        
B. How soon        
C. How long    
D. When

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