If these two colors, being color-blinded can be diagnosed.
A. not distinguished
B. one can’t distinguish
C. not distinguishing
D. one not having distinguished
网友回答
A. not distinguished
(答案→)B. one can’t distinguish
C. not distinguishing
D. one not having distinguished
解析：考查复合句。根据题中的if连词可知后面要跟句子所以只有B选项正确。