问题
选择题
We ________ on this project for four hours. Let's have a rest.[ ]
A. are working
B. have been working
C. worked
D. had worked
答案
答案：B
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We ________ on this project for four hours. Let's have a rest.[ ]
A. are working
B. have been working
C. worked
D. had worked
答案：B