i have been a teacher for twenty years.i ___ a teacher twenty years ___ （保持句意不变）

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i have been a teacher for twenty years.i ___ a teacher twenty years ___ （保持句意不变）

i have been a teacher for twenty years.i ___ a teacher twenty years ___ （保持句意不变）
i have been a teacher for twenty years.
i ___ a teacher twenty years ___ （保持句意不变）

i have been a teacher for twenty years.i ___ a teacher twenty years ___ （保持句意不变）
I have been a teacher for twenty years.
我已经做了20年教师了.
I _became__ a teacher twenty years __ago_ .

i became a teacher twenty years ago.

was ago
20年前，我就是一名教师。

第一个空wasn't
第二个空ago

I became a teacher twenty years ago.

I have been a person . i have been here many a I have been looking for a man. I have always been a person I have always been a maverick是什么意思 She （proposes） that we have a birthday party for our English teache I have been being a worker还是I have been a worker 句子改错：I (A.have been) (B.learning) English (C.since) I (D.have been) ten. i have been a perfect ass 如果是 have i been a perfect ass 这个 i 和 have I have been selling I have been trying I have ever been I too have been I have been to. I have been I have been in. Never in my life ___ in that manner.A.have I been spoken to B.have I been spoken C.Ihave been spokenD.I have been spoken to i have been here ( )a year.A,since B,for