This is an illness that can total blindness if it is left untreated.
A. result from
B. lead in
C. result in
D. leave behind
网友回答
A. result from
B. lead in
(答案→)C. result in
D. leave behind
解析：句意：这种病如果放任不治的话会导致完全失明。result from起因于（后跟原因）；lead in导入（开场白）；result in导致，结果是（后跟结果）；leave behind留下，遗留。根据句意故选C。