题目内容：

It was not until recently ( ) many people began to realize they were wrong.
A when B while C as D that
选什么,为什么?

优质解答

D
这个是强调句～
It is \was +被强调部份+ that \ who +原句剩余部份
句子意思：就是直到最近人们才开始发现他们错了