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    While Helen the piano, her mother came in. A. was playing B. is playing C. played D. plays 【查看更多】

     

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    While Helen _________the piano, her mother came in.           
    [     ]
    A. was playing  
    B. is playing    
    C. played        
    D. plays

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    While Helen ________ the piano，her mother came in．

    A．was playing        B．is playing          C．played            D．plays

     

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