This is an illness that can result in total blindness if ________.拜托了各位 谢谢A. leaving untreated B. left untreated C. leaving untreating D. left untreating

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This is an illness that can result in total blindness if ________.拜托了各位 谢谢
A. leaving untreated B. left untreated C. leaving untreating D. left untreating

答案B “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. 查看原帖>>