Some banks of the river were broken 根据问题补充,改为主动语态 __ __ some banks of the river

题目

Some banks of the river were broken 根据问题补充,改为主动语态 __ __ some banks of the river
Floods across the northern Mexican state of Coahuila killed at least 32 people and left 100 more missing.It was reported on Monday.The heavy rain hit the state all right last Friday,so some of the river were broken.Along the river about 3,000 families were seriously affected.

答案

Floods broke
被动语态是将原来句中的宾语变成主语,要变成主动语态就要把主语还原,被动句中的主语还原成主动句中的宾语,是洪水冲毁了河岸