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    As close friends , they used to school together . A. to walk B. walking C. to walking D. walk 【查看更多】

     

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    As close friends, they used_____to school together.    
    [     ]
    A. to walk    
    B. walking    
    C. to walking    
    D. walk

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    As close friends, they used ______ to school together.
    [     ]
    A. to walk
    B. walking
    C. to walking
    D. walk

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