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15.Experts warn that medical waste from hospitals,if      properly,may contribute to spreading diseases.(  )
A.not handledB.not being handled
C.not to be handledD.not having been handled

分析 专家警告说,如果医院的医疗垃圾不能正确的处理,可能会导致疾病的蔓延.

解答 答案A.
If 引导的条件句的主语是 medical waste from hospitals,与handle之间是被动关系,是"被处理",B.not being handled 没有正在被处理;C.not to be handled 不将被处理; D.not having been handled 已经没有被处理.由句意可知是对其实现在的虚拟,而此条件句中由于前面已经提到过而省略了主语和系动词be,因此应为not handled,故选A.

点评 考查的是虚拟语气的用法,主要是根据省略,得知是对现在的虚拟.

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