Scientific researches show that to a language one had better often get exposed to it.
A. acquire
B. access
C. acknowledge
D. assess
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(答案→)A. acquire
B. access
C. acknowledge
D. assess
解析:A. acquire(通过努力)获得(知识,技能),B. access接近,进入,使用,接近,获取C. acknowledge承认,D. assess评价,评估,句意:科学研究表明为了获得一种语言技能一个人最好经常接触它。选A。