一道高考英语单选

Question

I've got a copy already .You ( )com back to give one to me.But thank you all the same.
A.shouldn't
B.needn't
C.shouldn't have
D.needn't have
希望能在做出正确的答案之后,给每个选项详细的解释

Answer 1

D.needn't have sth done 本没必要做某事，但做了
shouldn't have sth done
不应该做某事，但做了

Answer 2

感觉是d

Answer 3

A.shouldn't

Answer 4

选第四项D
虚拟语气
本题考查 needn't have 表示本不必做（而事实上对方做了）
该句意思是：我已经有了一份附件，你本不必回来给我了！不过（既然你给了)还是要感谢你！
本题与其它选项毫无关系！
楼主明白了吗？

Answer 5

我怎么觉得是B呢~