sc求助

lendyUID：2301511

Evolutionary psychology holds that the human mind is not a "blank slate," but instead that it comprises specialized mental mechanisms that were developed as a way of solving specific problems human ancestors faced millions of years ago. (A) the human mind is not a "blank slate," but instead that it comprises specialized mental mechanisms that were developed as a way of solving (B) the human mind is not a "blank slate" but instead comprises specialized mental mechanisms that were developed to solve (C) the human mind, instead of a "blank slate," it comprises specialized mental mechanisms that have been developed to solve (D) rather than it being a "blank slate," the human mind comprises specialized mental mechanisms that have been developed as a way of solving

(E) rather than the human mind's being a "blank slate," that it comprises specialized mental mechanisms that were developed as a way of solving

答案选B ，小女子凭感觉不小心蒙对了，但是为什么对我说不出来啊，那个not..but在这里怎么平行的啊？请各位帮解释下啊！！承蒙帮助不胜感激，祝大家杀G好成绩~！！

lendyUID：2301511

主要是那个not a "blank slate" but instead comprises specialized mental mechanisms 为什么是平行啊