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

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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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