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

    A．left

    B．keeping

    C．remained

    D．making

     

    【答案】

    A

    【解析】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。

     

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