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Mr. Smith gradually _____ a knowledge of the subject.
A.attainedB.achievedC.requiredD.acquired
  D. acquired.
  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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