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.
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.