OG15其中一句的文法

[nature]

想請問一題複合閱讀及sc的問題
在OG15中的文章最後一句
Such measures would force financial institutions to become capitalists whose success depends not on trading shares at the propitious moment, but on increasing the productivity of the companies in which they invest
及SC P656第22題
The voluminous personal papers of Thomas Alva Edison reveal that his inventions typically sprang to life not in a flash of inspiration but evolved slowly from previous work.
答案:did not spring to life in a flash of inspiration but evolved alowly

請問一樣是 not....but的句型...為何 sc 的句型要改成did not....but 而閱讀句中使用 not...but,煩好心人士告知一下到底我是哪邊搞錯了....感激不盡

[Behemoth]

因為not...but...此片語前後要平衡

og15中是not on... but on... 的平衡

而sc中是動詞平衡

[nature]

了解....謝謝