It is a kind of illness that can result in total blindness if______.A、to leave u

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问题 It is a kind of illness that can result in total blindness if______.

选项 A、to leave untreated
B、is left untreated
C、leaving untreated
D、left untreated

答案 D

解析句意：这种疾病如果不治疗的话会导致完全失明。这里是状语从句的省略。条件句中，如果含有be动词。并且主语与主句主语一致，那么该从句的主语和be动词可以一起省略。故选项D正确。

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