因为$$-1 ~\textless{} ~b ~\textless{} ~a ~\textless{} ~0$$，所以$$a+b ~\textless{} ~a-b$$．  因为$$b\textgreater-1$$，所以$$a-1 ~\textless{} ~a+b$$．  又因为$$-b ~\textless{} ~1$$，所以$$a-b ~\textless{} ~a+1$$．  综上得$$a-1 ~\textless{} ~a+b ~\textless{} ~a-b ~\textless{} ~a+1$$．  故选$$\text{C}$$． 
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．
Options:
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: $$a+b\textgreater a-b\textgreater a+1\textgreater a-1$$ 