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

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This is an illness that can result in total blindness ______ left untreated.
A. after B. if C. since D. unless

选B。这种病如果放任不理的话会导致完全失明。

B

这里是状语从句的省略。状语从句中，如果主语后有be动词，可以一起省略，所以这里原句就是if it is left untreated.表示如果不处理，就会导致完全失明。

B
意思是如果不去治疗这个病就会导致盲...

This is an illness that can result in total blindness ______ left untreated
A. after B. if C. since D. unless
这是一种疾病，可导致完全失明______不及时治疗
A.离职后b.如果 C、自 D除非
答案是：B。

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