The idea -------everybody should learn to read and write has been accepted for only 200 years

问题描述:

The idea -------everybody should learn to read and write has been accepted for only 200 years
A/ Bwhich Cwhy Dthat 选B和D有什么差别,什么时候用which什么时候用that?

选D.此处为同位语从句,引导词that起连接作用但不能省略.the idea=everybody should learn to read and write.