网考网参考答案:B 网考网解析: 考查动词短语的意义和用法。set up除作“树立,设立”讲之外,还可表示“引起”,如:Smoking too much usually set up an irritation in the throat.(抽烟太多通常会引起嗓子发炎。)set in意为“开始,到来”,通常指一段令人不快的时期,如:Winter sets in early in the North.(北方冬天来得早。)set out意为“出发,开始”,如:All the people in the neighborhoods set out looking for the missing boy.(邻近所有的人都出发去找这个失踪的小男孩了。)set about意为“开始,着手”,如:Once she got into the house,she set about doing the cleaning.(她一进这所房子就开始打扫起来。)B为正确的选择。
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