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


  1. A.
    are working
  2. B.
    have been working
  3. C.
    worked
  4. D.
    had worked
B
考察時(shí)態(tài)。根據(jù)for four hours可知是與現(xiàn)在完成時(shí)連用的，在根據(jù)句意可知使用現(xiàn)在完成進(jìn)行時(shí)。句意：我們已經(jīng)一致工作了4個(gè)小時(shí)，讓我們休息一下。
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