----Have you known Professor Jackson in our department for a long time ?

----Yes, since he _____ the our university.

----Have you known Professor Jackson in our department for a long time ?
----Yes, since he _____ the our university

1. A.
   has come
2. B.
   comes
3. C.
   had come
4. D.
   came

----Have you known Professor Jackson in our department for a long time ?

   ----Yes, since he _____ the our university.

A. has come         B. comes                          C. had come            D. came