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来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/16 23:44:20

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The old man,____abroad for twenty years,is on the way back to his montherland.
为什么不填to have worked而填having worked?

楼上的回答得不对.
"to do sth."是不定式,多用来表示计划做某事和动作的趋向、目的、指示；动词的"-ing"形式可以表示伴随的状态和正在进行的动作.
由于是对“have worked”进行修饰,“老人工作了二十年之后回到祖国”,这里强调的是伴随的已经完结的状态,而不是指向性的未进行的动作.因此用动词的“-ing”形式而不是不定式.

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