题目

请在原文中找出与“描好了，立刻来一看，真像一只青蛙，”相呼应的句子。 答案： “门口一个黑影出现，好像一只立起的青蛙，向我们跳过来。”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