英语-请问这两句话有区别吗?i have specialized in teaching math for five years.i have been specialized in teaching math for five years.
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![英语-请问这两句话有区别吗?i have specialized in teaching math for five years.i have been specialized in teaching math for five years.](/uploads/image/z/8615324-20-4.jpg?t=%E8%8B%B1%E8%AF%AD-%E8%AF%B7%E9%97%AE%E8%BF%99%E4%B8%A4%E5%8F%A5%E8%AF%9D%E6%9C%89%E5%8C%BA%E5%88%AB%E5%90%97%3Fi+have+specialized+in+teaching+math+for+five+years.i+have+been+specialized+in+teaching+math+for+five+years.)
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