you don't mind if i open the window,____?

问题描述:

you don't mind if i open the window,____?
a,do you b,do i c,don't you d,don't i
the door needs painting,_____?a,needn't it b,doesn't it

A.do you?前面是否定句,所以用do you?
B.doesn't it?句子中的needs是实义动词,不是情态动词,所以用doesn't it 来反问.