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SAT 句子提升的两道题 继续求教

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SAT 句子提升的两道题 继续求教
The agency reports that by rigorously enforcing state regulations,industrial pollutions has been successfully reduced to acceptable levels.
我选的、也是要改的地方是industrial pollutions has been successfully reduced to acceptable levels.正确答案是it has succeeded in reducing industrial pollution to acceptable levels.
为什么这么选?和前半句里面的by后面的句子有关的原因么?不是尽量要避免出现it等指代模糊的词的情况么?
SAT 句子提升的两道题 继续求教
怎么说呢.主动比被动好.
虽然那句话也对.
但是
这个机构的调查显示,
by括起来不看.
it指代agency,而且是主动.
by后面是状语,删掉不看.
那原句是这样The agency reports that industrial pollutions has been successfully reduced to acceptable levels.就有点儿怪了,不知道是谁的工业污染.
改后是这样,The agency reports that it has succeeded in reducing industrial pollution to acceptable levels.就非常明确了.