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    for months, the room is very dirty. A. We don't clean it B. Having not cleaned C. Not having been cleaned D. Having not been cleaned 【查看更多】

     

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    ____ for months, the room is very dirty.
    [     ]
    A. We don't clean it          
    B. Having not cleaned
    C. Not having been cleaned    
    D. Having not been cleaned

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