-When you teaching in our school, Mr. Smith?-I here since 1998.A. did, started; have be——青夏教育精英家教网—

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—When_____ you_____teaching in our school, Mr. Smith?
—I_____here since 1998.

A. did, started; have been teaching
B. did, start; taught
C. did, start; have been teaching
D. have, been starting; taught

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