last year,the area was struck by floods,from----effects the

整句话可以转写成：
last year,the area was struck by floods,and the villagers are still suffering from its effects.
可以看出来,在定语从句中,被顶替的的是its,因此使用whose = its
翻译过来就是：
去年,这个地区受到洪水袭击,村民们至今仍受其后果危害.