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        1. —Why do you look so tired?
          —Because we ________ for three hours without stopping.
          A.workB.worked
          C.have workedD.were working
          C

          試題分析:句意:-為什么你們看起來這么疲憊?-因?yàn)槲覀円呀?jīng)不停地工作了三個(gè)小時(shí)了。work是一個(gè)動(dòng)詞,意思是工作。根據(jù)句意可知,說話人已經(jīng)工作了三個(gè)小時(shí)了,表示從三個(gè)小時(shí)之前就工作,一直持續(xù)到現(xiàn)在,故應(yīng)該用現(xiàn)在完成時(shí),故選C。A是一般現(xiàn)在時(shí);B是一般過去時(shí);D是過去進(jìn)行時(shí)。
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