–Why David you look so tired! –Well I a report for the whole day and I must finish it

问题补充：

–Why, David, you look so tired!

–Well, I a report for the whole day and I must finish it tomorrow.

A. was writing

B. will be writing

C. have written

D. have been writing

答案：

A. was writing

B. will be writing

C. have written

(答案→)D. have been writing

解析：考察时态。根据句中时间状语for the whole day可知与现在完成进行时连用。结合句意：我整天都在写报告。我每天一定会完成。