PREP-sc原题求助

Kiron

The relative prosperity of the first years of the twentieth century came to a halt in 1907 when drains on the money supply, revealing a weak national financial infrastructure of banking and credit, it precipitated an economic crisis that lasted nearly a year.

• 
  supply, revealing a weak national financial infrastructure of banking and credit, it precipitated
  
• 
  supply, revealing a weak national financial infrastructure of banking and credit, they precipitated
  
• 
  supply both revealed a weak national financial infrastructure of banking and credit and precipitating
  
• 
  supply revealed both a weak national financial infrastructure of banking and credit and precipitating
  
• 
  supply revealed a weak national infrastructure of banking and credit and precipitated
  
• 答案为什么是E？
  
  

Jarcy

A&B：从语法角度看，when drains on the money supply缺乏谓语
C： revealed 和 precipitating不平行
D：a weak XX 和 precipitating不平行
E：语法语意都正确： The prosperity came to a halt when drains revealed XX and precipatated XX.