题目

题型：不详难度：来源：

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

答案

C

解析

这题考查if条件句的省略，如果主从句的主语一致，可以省略从句的主语和be动词，这句话的if条件句是省略的，所以是主语a disease被省略了，a disease和untreat之间是被动关系，所以用C。