The patient will lose his sight _______ left untreated.

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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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专业英语四级

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