题目内容
We _______ on this project for four hours. Let’s have a rest.
A. are working B. have been working C. worked D. had worked
B
从句子的时间状语for four hours和后面的句子Let’s have a rest可知，动作从过去发生，到说话的时候一直在进行着，所以此处要用现在完成进行时态。
句意：我们在这项工程上一直工作了四个小时了。咱们休息一会儿吧。
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