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    The great invention he made of great benefit to the whole world. A. is proved B. has proved C. has been proved D. is proved to be 【查看更多】

     

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    The great invention he made _____ of great benefit to the whole world.
    [      ]
    A. is proved
    B. has proved
    C. has been proved
    D. is proved to be

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    The great invention he made ___ of great benefit to the whole world.
    [     ]
    A. is proved                    
    B. has proved  
    C. has been proved              
    D. is proved to be

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    The great invention he made ________ of great benefit to the whole world．

    [　　]

    A．is proved

    B．has proved

    C．has been proved

    D．is proved to be

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