关于More than 的用法,Johnson is more wise than diligent还是 Johnson is more wiser than diligent?

Johnson is more wise than diligent----Johnson 聪明大于勤奋(结构是：He is more A than B )
我明白你的意思了：He is wiser than he is diligent.===Johnson is more wise than diligent
Johnson is more wiser than diligent?(这是错句)但是参考书上有比较级的才是正确答案，我就有点搞不懂了。。。wise（原级）----wiser（比较级）。研究一下我的句子，不会错。我在外面教的就是高复班，他们就学这样的东西。