假设你刚刚得知你一直做进口生意的朋友john dever先生被提升为a公司副总经理（deputy managing director）,现代表你公司进口部给他写一封信表示祝贺（reference letter）。
dear mr dever：
it is a pleasure to congratulate you on your recent promotion to deputy managing director of a trading company.
BECause of our close association with you over the past ten years, we know how well you are qualified for this important Office. you earned the promotion through years of hard work and we are delighted to see your true ability win recognition.
agai, congratulations and best wishes for continued success.