摘要：29． , the disease would produce a powerful poison that would kill the patient． ( ) A．If leaving untreated B．If unthreading C．If to be untreated D．If left untreated
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People in Nome all had diphtheria, a disease that spreads very fast. If ________, it would produce a powerful poison that would kill the patient.
| A．untreating | B．to untreat | C．untreated | D．untreat |