问题
选择题
| We ____ hard together to achieve our common goal these years-to build a cleaner, safer and healthier world. |
| A. have been working B. are working C. work D. have worked |
答案
答案：A
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| We ____ hard together to achieve our common goal these years-to build a cleaner, safer and healthier world. |
| A. have been working B. are working C. work D. have worked |
答案：A