Unfortunately, when I arrived, Mary , so we only had time for a few words.
A. was just leaving
B. just left
C. has just left
D. had just left
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(答案→)A. was just leaving
B. just left
C. has just left
D. had just left
解析：考查时态。句意：不幸的是，当我们到达时，玛丽正要离开，因此我们只有时间说几句话。Leave等的现在进行时态可以表示将要进行的动作，故选A。