HE HAS WORKED AS A TEACHER SINCE 1999. A. HE DOES NOT WORK AS A TE...

31. He has worked as a teacher since 1999.

A. He does not work as a teacher from 1999 up to now.

B. He did not work as a teacher in 1999.

C. He worked as a teacher in 1999.

D. He began to work as a teacher in 1999.