I don’t feel a bit tired, although I ________ for a whole day without a minute's rest．

I don’t feel a bit tired, although I ________ for a whole day without a minute's rest．

A.work

B.am working

C.have worked

D.have been working

答案及解析： D

解析：

在这句句子中时间状语for a whole day without a minute's rest强调动作的持续性、不间断性，因此用现在完成进行时较好。