-You have been quite busy the whole afternoon.

-You have been quite busy the whole afternoon.
-Yes,I_____on my homework and it will take another twenty minutes or so
A.have worked
B.am working
C.have been working
D.will be working

分析题目
分析解释一下四个选项
解释一下全句的意思
谢谢~

Where have you been? have you been there? how have you been? Have you ( ) been to London? Where have you been hiding why have you been here? 翻译have you been tricked 如何回答“you have not been sick,have you ?” have you been /have you gone区别 do you have been qinghai lake? how