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继续语法问题.Wholesale prices in july rose more sharply than expec

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继续语法问题.
Wholesale prices in july rose more sharply than expected and at a faster rate than consumer prices,indicating that businesses were still protecting consumers from the full brunt(冲击) of higher energy costs.
这句中逗号后的部分是作状语,indicating是现在分词that后作其宾语,我想问的是这个状语从句的主语是哪一个?是不是状语从句的主语与主句的主语一致,因此从句的主语就省略掉了,并用非谓语动词ing的形式?
另外,假设这句的状语从句的主语与主句不一致,如果要省略的话是不是就要用到独立主格,用一个逻辑主语了?是这样理解吗?
indicating that businesses were .
对这个结构合理的解释是:indicating=which indicated的缩写,这是一个定语从句的省略.
那么这个定语从句的主语自然是which,指代前面的整个句子.
不能理解为非谓语作状语,因为非谓语的逻辑主语和主句是一样的,
如果是非谓语作状语的话,indicating that businesses were .这个结构的主语是
Wholesale prices(批发价),显然不合理,因为暗示后面内容的不是Wholesale prices,
而是Wholesale prices in july rose more sharply than expected and at a faster rate than consumer prices,整句话.
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