The doctor finally gave up the of medicine for full - time writing．A. days B. process C.

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A. days
B. process
C. skills
(答案→)D. practice
解析：考查名词辨析。A“日子”；B“进程”；C“技能”；D“实践，练习，惯例”。句意“那位医生最终放弃了医生的工作，转为专职写作。”故选D。