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

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

题目
( ),the disease diphtheria 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.
答案
D.If untreated
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