问题
选择题
They ____ on this project for l 4 hours, but it’s so difficult to persuade them to have a rest. [ ]
A. had worked
B. have been working
C. worked
D. are working
答案
答案：B
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They ____ on this project for l 4 hours, but it’s so difficult to persuade them to have a rest. [ ]
A. had worked
B. have been working
C. worked
D. are working
答案：B