--- Did you scold him for his carelessness?

    --- Yes, but        it.

       A．I’d rather not do             B．I’d rather not have done

       C．I shouldn’t do         D．I’d better not do

—Did you scold him for his carelessness?

—Yes, but __it．

　　　 A．I would rather not do B．I'd rather not have done

　　　 C．I shouldn't do　　　　　　　　　　 D．I'd better not do