Wouldn’t it be _____ wonderful world of all countries if the world lived in _____ peace with one another?

A a ；不填　　 B the;不填　 C a ;the 　　　　D the; the

Wouldn’t it be         wonderful world of all countries if          world lived in peace with one another?

A．the; the     B．a; a    C．a; the        D．the; a