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职称英语
The patient will lose his sight ______ left untreated.A、sinceB、unlessC、afterD
The patient will lose his sight ______ left untreated.A、sinceB、unlessC、afterD
游客
2023-10-26
31
管理
问题
The patient will lose his sight ______ left untreated.
选项
A、since
B、unless
C、after
D、if
答案
D
解析
连词的用法。if“如果”引导条件状语从句，由于从句主语与主句主语一致，从句的主语和be动词省略了，D正确。A和C选项都不能表示假设；B项unless"除非"，等于if not，与if意思正相反。
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