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Medical errors and various infections, i...

Medical errors and various infections, if _________, will be the third leading cause of death in the world.

A. being combined    B. to combine

C. having combined    D. combined

 

D 【解析】 考查状语从句省略。句意:医疗错误和各种感染如果结合在一起就会是世界上死亡的第三大原因。当状语从句主语与主句主语一致,且含有系动词的时候,我们可以把状语从句主语和系动词一起省略,构成省略句。本句在if后省略了medical errors and various infections are,所以D项正确。  
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