―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

―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

 ―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

―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

―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