Thisisanillnessthatcanresultinto

发布时间：2020-07-09 14:18:30

This is an illness that can result in total blindness if ________．













A.leaving untreated












B.left untreated











C.leaving untreating











D.left untreating

网友回答

B解析“if+过去分词”可视为条件从句的省略句，相当于if it is left untreated, untreated为过去分词作补足语。
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