英语改错题,句子中有一处错误2An important factor in a market-oriented economy is the mechanism by which consumer demands can be expressed and responded by producers.

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英语改错题,句子中有一处错误2An important factor in a market-oriented economy is the mechanism by which consumer demands can be expressed and responded by producers.
英语改错题,句子中有一处错误2
An important factor in a market-oriented economy is the mechanism by which consumer demands can be expressed and responded by producers.

英语改错题,句子中有一处错误2An important factor in a market-oriented economy is the mechanism by which consumer demands can be expressed and responded by producers.
把by which 改为 in which

demands 去掉s。 consumer demand表示消费者需求。