---Shall I help clean the kitchen, Mum?

---Thank you. But you _______ it because I can do it myself.

A. mustn’t have done　　　　　　　　　 B. wouldn’t have done　

C. mightn’t have done　　　　　　　　 D. haven’t got to do

—Shall I help clean the kitchen，Mum?

—Thank you. But you ________ it because I can do it myself.

A. mustn’t have done 　　 B. wouldn’t have done

C. mightn’t have done 　 D. haven’t got to do