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.

admin2012-09-13  45
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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