【題目】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：如果不及時治療的話，H1N1流感是一種能夠?qū)е滤劳龅募膊�。條件狀語從句unless it is treated in time中的it is被省略。

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