Unluckily, when I dropped in, Dr. Smith __________，so we only had time for a few words.
| A．was just leaving | B．has just left |
| C．had just left | D．just left |
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Unluckily, when I dropped in, Dr. Smith __________，so we only had time for a few words.
| A．was just leaving | B．has just left |
| C．had just left | D．just left |
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