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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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