题目内容

【题目】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

【答案】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

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