This is an illness that can result in totle blindness if( )A. to leave untreating B. left untreated C.leaving untreating D. is left untreated

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This is an illness that can result in totle blindness if( )
A. to leave untreating B. left untreated C.leaving untreating D. is left untreated

B
如果不被治疗,这种疾病将会导致完全失明.

选B

选B