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

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

admin2009-06-10  22
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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