Mr.Smith gradually _____ a knowledge of the subject.
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答案D

acquired (="gain" for oneself by skill or ability,by one's own efforts or behavior) (由技术、能力、努力或行为) 获得; 得到：He has acquired a good command of English language.(他已精通英语.) achieve,vt.取得 (胜利、成功等) ,实现 (目标、目的等) .attain,vt.达到 (目的等) ,取得 (成就等) ：1) I hope you will attain your object.(我希望你会达到你的目的.) 2) He attained success through hard work."

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