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