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

 

從句子的時間狀語for four hours和后面的句子Let’s have a rest可知，動作從過去發(fā)生，到說話的時候一直在進行著，所以此處要用現(xiàn)在完成進行時態(tài)。

句意：我們在這項工程上一直工作了四個小時了。咱們休息一會兒吧。

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