When I dropped in, Dr Smith _____, so we...

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

B 【解析】此题重点考查过去进行时的基本用法，表示过去某一时间正在进行的动作或存在的某种状态。

考点分析：

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