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】

試題分析：考查if條件句省略。在if條件句中，如果謂語動詞是“be”或含有“be”，而主語又和主句的主語一致或者主語是“it”時，從句中的主語可連同動詞“be”一起省去，形成if＋形容詞/分詞/名詞/代詞/副詞的結(jié)構(gòu)，本題從句補充完整應(yīng)是if it is not handled ……,可省略it is。句意：專家警告醫(yī)院的藥物垃圾如不妥善處理，也會導(dǎo)致疾病傳染。故選A

考點：考查考查if條件句省略。

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