—Has Sam finished his report?—I have no idea. He it in his office the whole morning.A. w

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。