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This is an illness that can result in total blindness______left untreated.A、afte
This is an illness that can result in total blindness______left untreated.A、afte
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2025-04-18
29
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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
本句中,if引导表假设关系的从句,完整成分应为if the illness is leftuntreated。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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