题目内容

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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