问题补充:
—You seem tired, David.
—Yes. I all day long and can’t wait to go to bed now.
A. am working
B. had been working
C. have been working
D. was working
答案:
A. am working
B. had been working
(答案→)C. have been working
D. was working
解析:考查时态。根据句意可知用现在完成进行时,句意:——戴维,你看起来很累。——是的,我工作了一整天,现在都迫不及待的的上床睡觉了。