The three sisters decided to hold a family party to their parents gold wedding.A. welcom

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A. wele
B. congratulate
C. memorize
(答案→)D. celebrate
解析：celebrate sth庆祝（节日、生日、纪念日等）；wele欢迎； congratulate sb on sth/doingsth祝贺，庆贺，恭喜某人的成功、成就、结婚等）；memorize记住。