As thEColumBiABroADCAsting SystEm ExpAnDED its opErAtions, soon BEComE thE lArgEst rADio nEtwork in thE UnitED StAtEs, it prECoCiously rECognizED thE potEntiAl For thE rApiDly Evolving tElEvision BroADCAsting tEChnology.
A、ExpAnDED
B、BEComE
C、lArgEst
D、Evolving