【題目】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】句意：專家警告說，如果醫(yī)院的醫(yī)療垃圾不能正確的處理，可能會導致疾病的蔓延。If 引導的條件句的主語是 medical waste from hospitals ，與handle之間是被動關(guān)系，故選A項。

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