这句话有没有错误?帮我改正

这句话有没有错误?帮我改正

题目
这句话有没有错误?帮我改正
He always had been engaged in database development in those companies,for which he worked since he graduated
答案
He had always been engaged in doing database development in those companies,for which he had worked since he graduated.
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奥巴马演讲不用看稿子.为什么中国领导演讲要看?
想找英语初三上学期的首字母填空练习……
英语翻译
1,人们染上烟瘾,最终因吸烟使自己丧命.
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