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Since 1961,I ___ （be） a teacher.Before that,I ___ （be） a stu

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Since 1961,I ___ （be） a teacher.Before that,I ___ （be） a student 1 has been 2 was
这样填对吗,请说下原因
为什么不是：
Since 1961,I was a teacher.Before that,I have been a student.
Since 1961,I ___ （be） a teacher.Before that,I ___ （be） a stu
你这样填应该是错误的,自1961年以来,我就是一名教师,这种动作一直持续到现在,应该要用现在完成时,所以应填have been !而在那之前,说的就是过去的事,所以要用一般过去时,应填was.
It has been ten years since I ___(be) a teacher. It would be a___ ___ for me because I want ___ ___ a teacher It ___(be)one and a half years since I __(begin) to study En The computer needs ___ before I can use it.A.be repaired B.r I promise that the matter will ___.A.be taken care B.be take 英语：I think she must be a teacher,___?怎么写? He must be a teacher,___ I hope ___(be)a pilot when i grow up I will be a teacher I hear that it won't be long before you leave for France,___ 句型转换：I hope I can be a teacher（同义句） I hope （ ) ( ) a teacher I ___(tell) that there would be a meeting the next week