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    his return from Europe, he set to work on the project. A. As B. At C. Upon D. For 【查看更多】

     

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    _____ his return from Europe, he set to work on the project.
    [     ]
    A. As
    B. At
    C. Upon
    D. For

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    ______ his return from Europe , he set to work on the project..

    A．As               B．At               C．Upon             D．For

     

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