With the development of economy, our income has increased 10% in less than a year.A. for B. by C. on

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【题目】With the development of economy, our income has increased ______ 10% in less than a year.

A. for B. by C. on D. at

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【答案】B

【解析】考查介词。句意：随着经济的发展，我们的收入一年内增加了10%。increase by 表示“增加了多少”。故选B。