— Did you see Dr Ma yesterday afternoon?— No. When I got to his office he already.A. lef

问题补充：

— Did you see Dr Ma yesterday afternoon?

— No. When I got to his office, he already.

A. left

B. has left

C. was leaving

D. had left

答案：

A. left

B. has left

C. was leaving

(答案→)D. had left

解析：句意：昨天下午你看见马博士了吗？——没有，当我到达他的办公室时，他已经离开了。结合语境可知下文描述的是过去某时前已经完成的动作，故用过去完成时态。选D。