This is an illness that can result in total blindness _____ left untreated.A、aft

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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

解析如果从句的主语和主句的主语一致，通常省略从句的主语和系动词，根据句意应选B。此句完整形式为：This is an illness that can result in total blindness if it is left untreated．

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