―Did you meet Professor Johnson?―Yes but when I arrived he so we only had time for a f

问题补充：

―Did you meet Professor Johnson?

―Yes, but when I arrived, he , so we only had time for a few words.

A. had just left

B. has just left

C. was just leaving

D. just left

答案：

A. had just left

B. has just left

(答案→)C. was just leaving

D. just left

解析：从下文“我们只交谈了几句话”来看，教授正要离开。这里使用leave的进行时态表示将要发生的动作。