GWD26-Q6 求助！——已解决！

6.  GWD26-Q6

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.

A.      supply, revealing a weak national financial infrastructure
  of banking and credit, it precipitated

B.      supply, revealing a weak national financial infrastructure of banking and credit, they precipitated

C.      supply both revealed a weak national financial
  infrastructure of banking and credit and precipitating

D.      supply revealed both a weak national financial infrastructure of banking and credit and precipitating

E.       supply revealed a weak national infrastructure of banking and credit and precipitated

为什么没人帮我解答一下？自己顶一下。

（The relative prosperity of the first years of the twentieth century）主语
        came to a halt in 1907 谓宾状语when drains on the money supply revealed a weak national infrastructure of banking and credit and precipitated  an economic crisis that lasted nearly a year. 状语从句

既然划线部分是个从句，那么就要用完整的句子了---单独看：when drains on the money supply revealed a weak national infrastructure of banking and credit and precipitated  an economic crisis that lasted nearly a year。应该是完整句子

多谢ediewang的解答。

我又想了一下，终于弄清楚此题如何解。

6.  GWD26-Q6

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.

A.      supply, revealing a weak national financial infrastructure
                of banking and credit, it precipitated （it precipitated...又是一句完整的句子=》 选此选项会造成两个句子用逗号连接，中间缺乏连词=》错）

A.      supply, revealing a weak national financial infrastructure
        of banking and credit, it precipitated （it precipitated...又是一句完整的句子=》 选此选项会造成两个句子用逗号连接，中间缺乏连词=》错）

B.      supply, revealing a weak national financial infrastructure of banking and credit, they precipitated （错误同A）

C.      supply both revealed a weak national financial
        infrastructure of banking and credit and precipitating （both...and...前后不平行对称）

D.      supply revealed both a weak national financial infrastructure of banking and credit and precipitating （错误同C）

E.       supply revealed a weak national infrastructure of banking and credit and precipitated (and前后的revealed与 precipitated 平行对称，此选项与when...连接，形成一句完整的状语从句)