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Experts warn that medical waste from hospitals, if properly, may contribute to spreading diseases.

A.not handled B.not being handled

C.not to be handled D.not having been handled

A

【解析】

试题分析:考查if条件句省略。在if条件句中,如果谓语动词是“be”或含有“be”,而主语又和主句的主语一致或者主语是“it”时,从句中的主语可连同动词“be”一起省去,形成if+形容词/分词/名词/代词/副词的结构,本题从句补充完整应是if it is not handled ……,可省略it is。句意:专家警告医院的药物垃圾如不妥善处理,也会导致疾病传染。故选A

考点:考查考查if条件句省略。

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