I am tired. I all day.A. am workingB. have been workingC. workedD. have been worked

问题补充：

I am tired. I all day.

A. am working

B. have been working

C. worked

D. have been worked

答案：

A. am working

(答案→)B. have been working

C. worked

D. have been worked

解析：本题句意“我很累。我一直在工作。”all day说明时间的持续。