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

问题补充：

Weon this project for four hours. Let’s have a rest.

A. are working

B. have been working

C. worked

D. had worked

答案：

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。