— 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
网友回答
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。