Question

We _______ on this project for four hours. Let’s have a rest.

A. are working
B. have been working
C. worked
D. had worked

Answer 1

答案B
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。