◎ 题干
____ in the city for thirty years, the old man moved back to the countryside.
A. Having worked
B. Working
C. To have worked
D. To work
◎ 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“____ in the city for thirty years, the old man moved back to the countryside.[ ]A. Having worked B. Working C. To have worked D. To work …”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。