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


解析:

考查動詞時態(tài)。句意為：“我們四個小時一直做這個項目。讓我們休息一下吧”，劇中出現(xiàn)for four hours這個時間狀語，可以判斷出使用現(xiàn)在完成時，根據(jù)句意又可知動作在持續(xù)進行當中，所以用現(xiàn)在完成進行時，故選B。

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