— Could I clean the bedroom for you?— No thanks. I it myself.A. cleanedB. have cleanedC.

问题补充：

— Could I clean the bedroom for you?

— No, thanks. I it myself.

A. cleaned

B. have cleaned

C. was cleaning

D. had cleaned

答案：

A. cleaned

(答案→)B. have cleaned

C. was cleaning

D. had cleaned

解析：既然不需要别人帮忙打扫卧室，说明“我已经打扫了”，应用现在完成时态，故选B。