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.
generated through wind power now than it was
generated through wind power now as it was
generated through wind power now as was the case
now generated through wind power as it was
now generated through wind power than was the case
对比句前后,it一定是同物指代(前后都是同一年风力产生的电能)
做对比局的时候,把as/than前后的成分单独拆开看,C选项是一个倒装:the case was in 1990
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