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
网友回答
A. untreating
B. to untreat
(答案→)C. untreated
D. untreat
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。