已知：$$-1 ~\textless{} ~b ~\textless{} ~a ~\textless{} ~0$$，那么$$a+b$$，$$a-b$$，$$a+1$$，$$a-1$$的大小关系是．
选项为:A:$$a+b ~\textless{} ~a-b ~\textless{} ~a-1 ~\textless{} ~a+1$$  B:$$a+1\textgreater a+b\textgreater a-b\textgreater a-1$$  C:$$a-1 ~\textless{} ~a+b ~\textless{} ~a-b ~\textless{} ~a+1$$  D:$$a+b\textgreater a-b\textgreater a+1\textgreater a-1$$  请回答其中一个选项.