（新唐书卷64）“方镇之患，始也各专其地以自世，既则迫於利害之谋；故其喜则连衡而叛上，怒则以力而相并，又其甚则起而弱王室。唐自中世以后，收功弥乱，虽常倚镇兵，而其亡也，亦终以此，可不戒哉！”针对唐代制度中的这种缺陷，宋元时期有哪些成功的做法？

①枢密院  

②三司  

③行省制  

④通判

A．①②③④

B．①②③

C．②③④

D．③④

There is no power like _____ power of confidence, and there is no student as competitive as ______

student who trusts his own abilities. [ ]

A . the; a          

B. a; the            

C. /; a          

D. the; /