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

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

选项 A、to leave untreating
B、left untreated
C、leaving untreating
D、is left untreated

答案B

解析 状语从句的省略形式,其完整形式是:…if it is left untreated.
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