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    It’s dangerous for us trees. A. to climb B. climbing C. climb D. climbed 【查看更多】

     

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    It's dangerous for us ______ trees.  
    [     ]
    A. to climb    
    B. climbing      
    C. climb      
    D. climbed

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    It’s dangerous for us _____ trees.
    [     ]
    A. to climb    
    B. climbing      
    C. climb      
    D. climbed

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