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    【题目】Experts warn that medical waste from hospitals, if properly, may lead to spreading diseases.

    A. not handled B. not being handled

    C. not to be handled D. not having handled

    【答案】A

    【解析】考查非谓语动词。句意：专家警告称来自医院的医疗废物如果不被合理处理，会导致疾病的扩散。根据题干中 if结构可以得知，是如果医疗废物不被处理medical waste are not handled，表示被动，省略主语和be动词，故选A。

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