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    Many provinces have been hit with smog. If _______ unsolved, the problem may lead to more serious results.

    A．having left B．to leave C．left D．leaving

    C

    解析试题分析：句意：很多省份都遭遇了雾霾，如果任由问题不解决，它会导致更严重的后果。这里if条件句是省略式，完整的是If the problem is left unsolved，…，如果主从句的主语一致的话，可以省略从句的主语和be动词，所以选C。
    考点：考查省略句

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