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.

admin2012-02-18  21
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 本句中，if引导表假设关系的从句，完整成分应为if the illness is left untreated。但因从句的主语与主句相同，习惯上常省略从句中的主语和系动词。因此答案为B。
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