he said that they would build a bridge. 中间为什么用that链接

问题描述:

he said that they would build a bridge. 中间为什么用that链接

这是一句That引导的宾语从句,that后面的部分作为said的宾语,当然,在宾语从句中that可以省略.原句可改为:He said they would build a bridge.