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职称英语
This is an illness that can result in total blindness __________ left untreated.
This is an illness that can result in total blindness __________ left untreated.
游客
2023-11-22
71
管理
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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