问题补充:
—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:
A. writes
B. has written
C. will write
D. was writing
解析: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。