The teacher______, they went on with their discussion.A、leavingB、bring leftC、w

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问题 The teacher______, they went on with their discussion.

选项 A、leaving
B、bring left
C、was leaving
D、having left

答案 D

解析本题考查独立主格结构辨析。leave与teacher构成逻辑上的主谓关系，故用现在分词，由于老师离开的动作在前，所以用having done表示动作先后关系。故选D。

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