This is an illness that can result in total blindness ______ left untreated.A、if

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问题 This is an illness that can result in total blindness ______ left untreated.

选项 A、if
B、after
C、since
D、because

答案 A

解析 if在这里引导的是条件状语从句，其中省略了it is。故答案为A。

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