the disease diphtheria would produce a powerful poison that would kill the paient.A. If

问题补充：

, the disease diphtheria would produce a powerful poison that would kill the paient.

A. If untreated

B. If it untreated

C. To be untreated

D. If being untreated

答案：

(答案→)A. If untreated

B. If it untreated

C. To be untreated

D. If being untreated

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