This is an illness that can result in total blindness______left untreated.

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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 连接词辨析题。题意:“如果不治疗的话,这种疾病可能导致彻底失明。”A after:以后。C since:自……以来。 D unless:除非。A,C,D三个选项均不符合题意。
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