The early warning of floods over the radio and on TV spread quickly through the area.A.

问题补充：

The early warning of floods, over the radio and on TV, spread quickly through the area.

A. having broadcast

B. broadcasting

C. broadcast

D. to be broadcast

答案：

A. having broadcast

B. broadcasting

(答案→)C. broadcast

D. to be broadcast

解析：考查非谓语动词。逻辑主语为warning of floods，与broadcast之间为被动关系。故用过去分词。句意：关于洪水的早期警报，通过广播和电视的播送，快速地在这一区域传播开来。