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。