题目

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 答案：D 解析: 从“我们只谈了几句话”可知，当我们去拜访时，Professor Smith“正要”离开了，D是过去进行时表示过去将来意义。

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