With a subordinator: In some situations the pursuit of knowledge

With a subordinator: In some situations the pursuit of knowledge may become harmful _______it is combined with wisdom.
【正确答案】：unless
【题目解析】：根据句意，前半部分为追求知识可能会变得有害；后半部分为它与智慧结合在一起。可判断此处为条件状语从句。句意：在某些情况下，追求知识可能变得有害，除非它与智慧结合在 一起