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    ( ) The students put up some signs the riverside the water clean. A. by , to keep B. at , to keep C. by , keep D .in , for 【查看更多】

     

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    The students put up some signs ________ the riverside ________ the water clean.        
    [     ]
    A. by, to keep 
    B. at, to keep    
    C. by, keep   
    D. in, for 

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