(Walk) ________a long way, Robbins began to feel tired.Having walked分析句子可知，主干结构完

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问题 (Walk) ________a long way, Robbins began to feel tired.

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答案 Having walked

解析分析句子可知，主干结构完整，所以确定此处要用非谓语动词形式。分析句意可知，Robbins是walk的逻辑主语，两者之间存在逻辑上的主动关系，且walk的动作在主句的动作began之前发生，所以要用完成时态。综上所述，空格处应填入：Having walked。

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