22. 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 works.
A. sprang to life not in a flash of inspiration but evolved slowly
B. sprang to life not in a flash of inspiration but were slowly evolved
C. did not spring to life in a flash of inspiration but evolved slowly
D. did not spring to life in a flash of inspiration but had slowly evolved
E. did not spring to life in a flash of inspiration but they were slowly evolved
 
1．  并列结构  （一级排除 A,B,D）
not … but 结构 ， 前后的形式，时态都要绝对平行
并列结构的时态要一致才是并列!!!è互相并列的成分是不能作为时间参照点的 
 
2．  被动语态(二级排除 E )
被动语态在GMAT中必须有理由才能出现。(使用被动态一定要由根据)è出现by