Unfortunately, when I dropped in, Professor Smith ________, so we only had time for a few words. A.has just left B.had just left C.just left D.was just leaving

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Unfortunately, when I dropped in, Professor Smith ________, so we only had time for a few words.
A.has just left
B.had just left
C.just left
D.was just leaving

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江苏开放大学建筑材料作业3