Weon this project for four hours. Let’s have a rest.A. are workingB. have been workingC. w

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A. are working
(答案→)B. have been working
C. worked
D. had worked
解析：考察时态，根据 Let’s have a rest.可知一直都在工作。“我们一直做这个项目4个小时了，歇歇吧。”答案B。