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    【题目】We had better pay attention to some health problems that, when ________ in time, can become bigger ones later on.

    A. not treated B. not to be treated

    C. not having been treated D. not being treated

    【答案】A

    【解析】

    考查分词做状语。句意：我们最好注意一些健康问题，当这些健康问题没有被及时解决的时候，后来就可能成为了大问题。定语从句的主语that，也就是some health problems与动词treat构成被动关系，所以使用过去分词形式，否定式是在前面直接加not。本句也可以理解为是省略句，在when的后面省略了they are。所以A项正确。

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