完全没有思路的一道GWD

wjk

Q1:
So dogged were Frances Perkins’ investigations of the garment industry, and her lobbying for wage and hour reform was persistent, Alfred E. Smith and Franklin D. Roosevelt recruited Perkins to work within the government, rather than as a social worker.

1. and her lobbying for wage and hour reform was persistent,
   
2. and lobbying for wage and hour reform was persistent, so that
   
3. her lobbying for wage and hour reform persistent, that
   
4. lobbying for wage and hour reform was so persistent,
   
5. so persistent her lobbying for wage and hour reform, that
   

Answer: E
第一次做到这种类型的题目，非常不解，求高手指点一下为什么选E?谢谢！！！

aeoluseros

just keep parallelism in mind.