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    ________so, you will receive a registration code(注册码)by mail, with instructions to register the program．

    [　　]
    A．

    With doing

    B．

    Upon doing

    C．

    As soon doing

    D．

    At doing

    答案：B
    解析：

    upon doing so“一那样做了就会……”，相当于as soon as。


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