若四个有理数$$a$$，$$b$$，$$c$$，$$d$$满足$$\frac{1}{a-1997}=\frac{1}{b+1998}=\frac{1}{c-1999}=\frac{1}{d+2000}$$，则$$a$$，$$b$$，$$c$$，$$d$$的大小关系是．
选项为:A:$$a\textgreater c\textgreater b\textgreater d$$  B:$$b\textgreater d\textgreater a\textgreater c$$  C:$$c\textgreater a\textgreater b\textgreater d$$  D:$$d\textgreater b\textgreater a\textgreater c$$  请回答其中一个选项.