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    This problem may lead to more serious ones if ________ unsolved．

    [　　]

    A．making

    B．remained

    C．keeping

    D．left

    答案：D
    提示：

    本题考查省略句的用法。此处完整的句子应为：This problem may lead to more serious ones if it is left unsolved．在从句中如果主语与主句的主语一致时，常将从句的主语和谓语的一部分省略(常常是be的形式)。


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