, the disease will produce a powder poison that will kill the patient.
A．If it untreatedB．If is untreated
C．If being untreated D．If untreated
D

試題分析：句意：如果不得到治療，這種疾病將會產(chǎn)生殺死病人的粉末狀病毒。完整形式為：If the disease diphtheria is untreated…，從句的主語與be動詞省略了，選D。
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