请选择CBA)O4N0d1a,D(g3Z'e8}:t We all think that the_________ century will bring us more hopes./G:_0r,W;U0b4?
A.twenty first/G:_0r,W;U0b4?
B.twentieth first/G:_0r,W;U0b4?
C.twentieth one/G:_0r,W;U0b4?