问题补充:
— Why, David, you look so tired!
— Well, I an article and I must finish it tomorrow.
A. was writing
B. will be writing
C. have been writing
D. have written
答案:
A. was writing
B. will be writing
(答案→)C. have been writing
D. have written
解析:考查时态,句意:大卫,你为什么看起来这么累呢?哦,我一直在写文章我必须明天完成。根据语境动作是从过去开始一直持续到现在还要持续下去,故用现在完成进行时,选C。