是at about ten years 还是for about ten years

是at about ten years 还是for about ten years Mr Green Lived in China for about ten years.对for about ten y About ten years ago when I was at Unviersity he has bought the TV set for about ten years How long _____ the watch?---For about ten years Write about your life in ten years He ( ) for ten years Mr Green worked in China for about ten years(对划线部分提问 划线部分是fo 英语翻译About ten years ago when I was a student at college , I About ten years ago when I was a student at college ,I spent About ten years ago when I was a student at college,I spent 开头为about ten years ago when i was a student at college 的英语习题