The scientists say that solar panels covering just 30% of the lakes could save as much water as 300,000 people would use in a year.
这个句子中as 300,000 people would use in a year是as引导的比较状语从句吗？
是的，as引导比较分句。主句比较项为as much water，其对应项在比较分句中作use的宾语，必须省略，use的宾语为空位。
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