题目内容

When I dropped in, Dr Smith ________, so we only had time for a few words.


  1. A.
    just left
  2. B.
    was just leaving
  3. C.
    has just left
  4. D.
    had just left
B
根据题干when I dropped in为过去的某一点时间,句子要用过去进行时。
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