This is an illness that may result in to
题型:选择题
问题:
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
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