—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?-因為我們已經(jīng)不停地工作了三個小時了。work是一個動詞,意思是工作。根據(jù)句意可知,說話人已經(jīng)工作了三個小時了,表示從三個小時之前就工作,一直持續(xù)到現(xiàn)在,故應該用現(xiàn)在完成時,故選C。A是一般現(xiàn)在時;B是一般過去時;D是過去進行時。
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