Question

—Catherine, I have cleaned the room for you.
—Thanks, you __________it. I could manage it myself.

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

Answer 1

B

本题考查情态动词.根据句意可知Catherine对对方为她打扫了房间表示感谢并提到对方不必为她打扫房间。needn’t do不需要做……；mustn’t禁止做……，都用于现在的动作；needn’t have done表示做了本来不必去做的事；shouldn’t have done是本不该做却做某事。