I became a teacher ten years ______. I have been a teacher _______ 2008.
| A．ago; for | B．before; since |
| C．ago; since | D．ago; in |
I became a teacher ten years ______. I have been a teacher _______ 2008.
| A．ago; for | B．before; since |
| C．ago; since | D．ago; in |
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