Question

attach importance to doing /do后面应该是doing还是do

Answer 1

后面应该是doing.

attach importance to 后面须加名词或动名词。例如：
1. We attached much importance to his visit (我们对他的访问很重视)
2. We attached importance to reviewing the samples before order (下单之前我们对检查样品很重视)

Answer 2

应该是doing 因为to是介词后跟doing.
例句：This means that students should not only attach importance to solving the rules of subject knowledge training,but also attached great importance to its culture of doing things the rules.
这就意味着既要重视学生学科知识解题规则的培养,又要重视其处事规则的培养.