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【单选题】

This is an illness that can result in total blindness __________ left untreated.
A.after

B.if
C.since
D.unless
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根据网考网移动考试中心的统计,该试题:

15%的考友选择了A选项

64%的考友选择了B选项

5%的考友选择了C选项

16%的考友选择了D选项

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