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

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

【答案】B

【解析】考查介詞。句意：隨著經(jīng)濟(jì)的發(fā)展，我們的收入一年內(nèi)增加了10%。increase by 表示“增加了多少”。故選B。

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