Mr. Smith gradually______a knowledge of the subject.

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问题 Mr. Smith gradually______a knowledge of the subject.

选项 A、attained
B、achieved
C、required
D、acquired

答案D

解析 acquired(由技术、能力、努力或行为)获得;得到;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);require,vt.要求,与其他三个词汇意义相差较远。
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