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This is an illness that can result in total blindness if_______.

A. to leave untreating   B. left untreated   C. leaving untreating   D. is left untreated

This is an illness that can result in total blindness if_______.

A. to leave untreating   B. left untreated   C. leaving untreating   D. is left untreated

This is an illness that can result in total blindness if_______.

A. to leave untreating   B. left untreated   C. leaving untreating   D. is left untreated

This is an illness that can result in total blindness if ________ untreated in time.

A. being left              B. left               C. to be left            D. leaving