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

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

admin2016-11-21  20
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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