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    【题目】There are some health problems that, when ______ in time, can become bigger ones later on.

    A. not treated B. not being treated

    C. not to be treated D. not have been treated

    【答案】A

    【解析】

    试题分析：考查非谓语动词。在该句中，逻辑主语是some health problems，与 treat之间构成被动关系，表示“没有被治疗的话”，所以用过去分词，这里答案选A项。B，C和D项虽然也都表示“被动“，但B项意为“正在被治疗，强调正在进行的动作”；C项意为“将要被治疗，意为将来的动作”；D项则意为“早就已经被治疗，强调已经完成”，故都排除。

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