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    ( ) --- Do you still write to your friends these days? --- No, but I used that when I was at school. A. do B. did C. done D. to do 【查看更多】

     

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    —Do you still write to your friends these days?        
    —No, but I used ______ that when I was at school.      
    [     ]
    A. do               
    B. did                 
    C. done             
    D. to do

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