【題目】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】考查非謂語動詞。句意：專家警告稱來自醫(yī)院的醫(yī)療廢物如果不被合理處理，會導(dǎo)致疾病的擴散。根據(jù)題干中 if結(jié)構(gòu)可以得知，是如果醫(yī)療廢物不被處理medical waste are not handled，表示被動，省略主語和be動詞，故選A。

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