问题
选择题
________， 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
答案：D
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________， 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