-When did you become a teacher?-In 1999.I___in this school since then.

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-When did you become a teacher?-In 1999.I___in this school since then.
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-When did you become a teacher?-In 1999.I___in this school since then.
-When did you become a teacher?-In 1999.I___in this school since then.

-When did you become a teacher?-In 1999.I___in this school since then.
have been
since then是现在完成时的标志

have taught
现在完成时态

不知