问题
选择题
| ____ 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 |
答案
答案：A
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| ____ 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：A