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    It’s necessary us blind people cross the street. A. of; to help B. to; helping C. for; to help D. for; help 【查看更多】

     

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    It's necessary _____ us _____ blind people cross the street.
    [     ]
    A. of; to help
    B. to; helping
    C. for; to help
    D. for; help

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