问题
选择题
This is an illness that may result in total blindness if _____. [ ]
A. being left untreated
B. left untreated
C. not left treating
D. not having left untreated
答案
答案：B
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This is an illness that may result in total blindness if _____. [ ]
A. being left untreated
B. left untreated
C. not left treating
D. not having left untreated
答案：B