This is an illness that can result in total blindness _________ left untreated.A

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问题 This is an illness that can result in total blindness _________ left untreated.

选项 A、after
B、if
C、since
D、unless

答案 B

解析真实条件句的缩略式。完整的真实条件句是“if the illness is left untreated”。请参阅第一套模拟题注释74。

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