--- Hi Grandma why do you look so tired? --- I’m tired. I the cleaning all morning.A.

问题补充：

--- 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：

A. did

B. had done

(答案→)C. have been doing

D. have done

解析：可联系答案网客服索取此答案。