In order to a good knowledge of French, he gave up his favorite job and set off for France

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(答案→)A. acquire
B. adapt
C. acknowledge
D. accelerate
解析：句意:为了掌握法语, 他放弃了他钟爱的工作,前往法国。acquire意思为“得到, 获得”，通常指后天学得或习得的知识、技能等。adapt适应；改编；acknowledge承认；答谢；accelerate加速；催促；促进。