Parents are taught to underatand__important education is to their children`s future

题目

Parents are taught to underatand__important education is to their children`s future
A,that B.how C.such D.so
我知道选B.这里是感叹句式的宾语从句用法.对形容词进行感叹,用how.但是选C或D理解起来也通啊,为什么不行呢?语法上有什么错误吗?抱歉,本人理科女,求英语大神详解.

答案

如果用such so这个宾语从句要这么变Parents are taught to underatand （that) such education is important to their children`s future(教育不可数,否则such后面要加an) Parents are taught to underatand （tha...