请问which修饰的是谁

which 不是充当主语、宾语或表语的代词就是就是修饰名词的形容词。本句是主从复合句，其结构如下：〔主句〕corporate tax cut will certainly motivate the private sector, 〔非限制性定语从句〕which will be the driving force for economic recovery in the country很明显，which 是从句中充当主语的关系代词。