—Has Sam finished his report?
—I have no idea. He _______ it in his office the whole morning.       
A．writesB．has written
C．will writeD．was writing
D  

試題分析：句意：山姆已經(jīng)完成了他的報告嗎？我也不清楚。整個上午他都在他的辦公室里寫。根據(jù)the whole morning.就可知該用過去進行時，所以選D。
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