It is an illness that can result in total deaf________ left untreated.
问题描述：
It is an illness that can result in total deaf________ left untreated.
(A) after
(B) if
(C) since
(D) unless
答
B
意思是：它是一种如果放着不治疗就会导致全聋的疾病.
其他几个选项意思不对.