the answer is B,tell me why pleaseThis is an illness that can result in totle blindness if( )A.to leave untreating B.left untreated C.leaving untreating D.is left untreated
问题描述：
the answer is B,tell me why please
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
答
正确答案是B.
illness“病”应该是被treated“处置”或untreated,由此已经排除掉了A和C,而选项D的本意是if后面连接一个从句,但错在从句少了主语it（指前面的an illness）,如果加上it,则可以把B理解为D的简化版.