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.

admin2014-10-11  53
问题 This is an illness that can result in total blindness______left untreated.
选项 A、if
B、after
C、since
D、because
答案A
解析 if在这里引导的是条件状语从句，其中省略了it is。故答案为A。
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