1 . -- Catherine, I have cleaned the room for you.
---Thanks. You _______ it. I could manage it myself.

A．needn’t do

B．shouldn’t have done

C．mustn’t do

D．needn’t have done

2 . It was very kind of you to do the washing-up, but you _____ it.

A．needn’t do	B．shouldn’t do
C．mustn’t have done	D．needn’t have done

3 . You _____ have bought the book for me, but thank you all the same.

A．shouldn’t

B．needn’t

C．can’t

D．mustn’t