2. 外语
  3. The old man, ______ abroad for twenty years, is on the way back to his motherland.

The old man, ______ abroad for twenty years, is on the way back to his motherland.

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问题 The old man, ______ abroad for twenty years, is on the way back to his motherland.
选项 A、to work
B、working
C、to have worked
D、having worked
答案D
解析 不定式表将来打算，现在分词的一般式表主动进行；从for twenty years(已经工作20年了)看，要用现在分词的完成式。所以选D项。
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