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 SARSisanillnessthatcanresultindeathunless

问题详情:

 SARSisanillnessthatcanresultindeathunless

 SARS is an illness that can result in death unless _______in time.

A. to treat          B. treating         C. treated         D. treat

【回答】

C

知识点:非谓语动词

题型:选择题

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