神马品牌网绿色gdp核算:这个题怎么做，为什么？
来源：百度文库 编辑：神马品牌网 时间：2024/05/11 14:06:57
31. 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
the way back to his motherland.
A. to work B. working C. to have worked
D. having worked
D 这个已经在海外工作了20年的老家伙，正在返回祖国的路上