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.
the answer is B,tell me why please
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