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   

1、B

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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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