◎ 题干
The old man, ____________ abroad for twenty years,is on the way back to his motherland
[     ]

A.to work
B.working
C.to have worked
D.having worked

◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“The old man, ____________ abroad for twenty years,is on the way back to his motherland[ ]A.towork B.working C.tohaveworked D.havingworked …”主要考查了你对  【现在分词的完成式】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。