题目内容
【题目】Influenza HINI is an illness that can result in death unless ______ in time.
A. treat B. to treat
C. treating D. treated
【答案】D
【解析】句意:如果不及时治疗的话,H1N1流感是一种能够导致死亡的疾病。条件状语从句unless it is treated in time中的it is被省略。
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