对将来的虚拟语气Unlikeglobalwarmingandozonedepletion----which,ifthepoliticalwillisthere,couldbereducedbycuttinggasemissions.改错题.它正确答案是把if后面的is改为were.它的题是不是错了啊?is前面还有

　　对将来的虚拟语气

　　Unlikeglobalwarmingandozonedepletion----which,ifthepoliticalwillisthere,couldbereducedbycuttinggasemissions.改错题.它正确答案是把if后面的is改为were.它的题是不是错了啊?is前面还有一个will的么?