练习册

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    If anything the machine, please let us know. A. happens on B. happens to C. happened on D. will happen to 【查看更多】

     

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    If anything         the machine, please let us know.

    A. happens on           B. happens to                   C. happened on               D. will happen to

     

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    If anything __________the machine, please let us know.  
    [     ]
    A. happens on        
    B. happens to  
    C. happened on        
    D. happen to

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