问题
选择题
—Has Sam finished his report?
—I have no idea. He _______ it in his office the whole morning.
A．writes
B．has written
C．will write
D．was writing
答案
D
题目分析：句意：山姆已经完成了他的报告吗？我也不清楚。整个上午他都在他的办公室里写。根据the whole morning.就可知该用过去进行时，所以选D。