This is an illness that can result in total blindness______left untreated.A、afte

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问题 This is an illness that can result in total blindness______left untreated.

选项 A、after
B、if
C、since
D、unless

答案 B

解析本句中，if引导表假设关系的从句，完整成分应为if the illness is leftuntreated。但因从句的主语与主句相同，习惯上常省略从句中的主语和系动词。因此答案为B。

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