问题
选择题
--- Hi, Grandma, why do you look so tired?
--- I’m tired. I _______ the cleaning all morning.
A．did
B．had done
C．have been doing
D．have done
答案
答案：C
搜题请搜索小程序“爱下问搜题”
--- Hi, Grandma, why do you look so tired?
--- I’m tired. I _______ the cleaning all morning.
A．did
B．had done
C．have been doing
D．have done
答案：C