It ____ ever since 1924. A.has been broadcast B.has been broadcasting C.has been broadcasted

问题描述:

It ____ ever since 1924. A.has been broadcast B.has been broadcasting C.has been broadcasted
请速速速速速速回答案,真的很急急急急急急。

It 如果指电台的话,那么选B ,电台播放节目 是主动的
it 如果指节目的话,那么选AC都可以,既然AC都行,那么都排除了吧,
还是选B吧