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题库 / Prep2007E2-SC-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.
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
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it是关系代词，而每个代词在句子都需要明确的所指代的对象即前置词。从整个句子看，冒号后是个独立完整的句子，句子的主语是more than ten times as much energy，且是该句子唯一的名词，故而it指代的是more than ten times as much energy，注意不是energy。而此处more than ten times as much enery在此处作为it的前置词是无意义的。所以所有使用it的都是错误的选项。
只能用the case概括
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