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

问题补充：

----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

答案：

A. has come

B. comes

C. had come

(答案→)D. came

解析：在英文中，since从句通常跟一般过去时，故本题用来的过去式came，故本题选D。