case在平行结构中的用法

jeans2011

恳请各位路过的NN及非NN们给予解答！这是XDF讲义上的一道题：
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.
(A) generated through wind power now than it was
(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
为什么不能选B呢？是因为应该用did吗？还有now放后面和放前面是一样的吧？

jeans2011

忘了说答案了。。。答案是C。。。

MarsTOF

注意一个比较特殊的题：
2-96 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.
(A) generated through wind power now than it was
(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
key: C
首先这个题目因为时态的转变必须补出was，其次比较对象是整句话的属性，而不仅仅是energy，所以不用that来补出，但是却又不能用it来指代主语，所以就只能用as was the case了。

AEO 版主的解答~

jeans2011

哦。。是不是就是传说中的代词不能指代前句？