30. 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D，C的now是副词，记得OG上说副词放在动词后不好啊，还有as was the case也怪怪的样子。。。
D错在it.这里it毫无疑问指代energy,可是it 指代的是相同的事物比如: there is a desk and it has four legs.显然这里的现在产生的energy和1990年的不是一回事儿。而C 的as was the case避免了这个错误，这个用法就像doing so一样表示重复指代。
這題出得很整人。
as is (was) the case 是idiomatic usage，字典上有: as is often the case，題目將 often省去罷了!
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