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This is an illness that can result in total blindness if ．A.leaving untreatedB.l

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This is an illness that can result in total blindness if ．A.leaving untreatedB.l

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

A.leaving untreated

B.left untreated

C.leaving untreating

D.left untreating

试题答案

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。

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