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英语
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be useful to do sth 与be useful in doing sth的区别
最好带有例句.
人气:185 ℃ 时间:2020-05-22 21:37:08
解答
be useful to...对什么有用:This guidebook will be useful to him.这本指南对他会有用.be useful in doing sth 对做什么事有用
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