i have been buying the lottery for almost twenty years but i

i have been buying the lottery for almost twenty years but i I have been living in the United States for twenty years,but i have been a teacher for twenty years. I have been a teacher for twenty years 对for twenty years提问 i have been living in the United States for twenty years I have been living in the United States for many years,but s i have been the usa 3 years ago 还是i have been the usa for 3 I have been living in Shanghai for two years,but i have not I HAVE BEEN PLAYED THE FLUTE FOR FOUR YEARS 求解释The Smiths____Beijing for years. （have been i i have been a teacher for twenty years（保持原句意思） i ___ ___ ___ I have been an engineer for more than ten years,but I was on