_______, the disease will produce a kind of poison that will kill the patient.
A.If it untreated
B.If is untreated
C.If being untreated
D.If untreated
网友回答
D解析这题考查if条件句的省略式：当主从句的主语一致时，可以省略主语和be动词，If untreated=if the disease is treated，句意是：如果这个病不治疗的话会产生一种毒药制人的命。选D