什么 makes me feel happy填it 还是 this

所用结构：sth make sb happy这里,用【It,This,That】都可以,即：It/This/That makes me feel happy。但是,如果句子后面还有其他部分内容,而且所加内容正好是【真主语】时,就必须用【It】作【形式主语】。例如：It makes me happy to have helped you。orIt makes me happy helping others。祝你开心如意!