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    The burning of rainforests is directly to the so-called greenhouse effect. A. contributing B. attributing C. constituting D. associating 【查看更多】

     

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    The burning of rainforests is directly _______ to the so-called greenhouse effect.     
    [     ]
    A. contributing    
    B. attributing    
    C. constituting      
    D. associating    

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