PREP2-96句子结构求助!

There are hopeful signs that we are shifting away from our heavy reliance on fossil fuels:  more than ten times as much energy is generated through wind power now than it was in 1990.

(B) generated through wind power now
    as
    it was

(C) generated through wind power now
    as
    was the case

(D) now generated through wind power as
    it was

(E) now generated through wind power than was the case

正确选项是C. 我的问题是把C带入划线部分,那么就是more than ten times as much energy is generated through wind power now
    as
    was the case.

那么这句话的主谓宾结构是什么? 感觉more than ten times as much energy没有办法作主语啊…… 大家讨论！NN指教！非常感谢！！！