--- Hi, Grandma, why do you look so tire
题型:选择题
问题:
--- 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
--- 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