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        , the disease will produce a powder poison that will kill the patient.

A.If it untreated B.If is untreated 
C.If being untreated  D.If untreated 

D

解析试题分析:句意:如果不得到治疗,这种疾病将会产生杀死病人的粉末状病毒。完整形式为:If the disease diphtheria is untreated…,从句的主语与be动词省略了,选D。
考点:考查状语从句的省略

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