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14.Influenza H1N1is an illness that can result in death unless left       in time.(  )
A.treatB.to treatC.treatingD.treated

分析 流感病毒H1N1是一种能导致死亡的疾病,除非及时治疗.

解答 答案是D.本题考查过去分词做补语.分析句子结构发现句中存在"连词+分词"的结构,即"unless left____ in time",分词的逻辑主语就是句子的主语,即Influenza H1N1,与treat之间存在被动关系,所以选择过去分词表示被动,答案选择D,其它选项没有被动的含义.

点评 首先判断选项中的动词在句中是以谓语还是非谓语形式出现,然后根据选项在句中的功能结合非谓语的基本用法做出合理的判断.

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