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

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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

解析语法规则。if 后接过去分词短语，省略的成分为主语+系动词，该主语须与主语同指方可省略。此句省略了 the illness is。untreated 为从句中的主语补足语，unless 用在此句意思上不符。

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