问题补充:
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:
A. are working
(答案→)B. have been working
C. worked
D. had worked
解析:考察时态。根据for four hours可知是与现在完成时连用的,在根据句意可知使用现在完成进行时。句意:我们已经一致工作了4个小时,让我们休息一下。
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