They have more difficulry in aggreeing on what characterizes

问题描述：

They have more difficulry in aggreeing on what characterizes a "good" teache
They have more difficulry in aggreeing( on what) characterizes a "good" teacher.
on是介词,后面怎么接了what从句?
这是什么用法?没有连接词也可以加从句?

1个回答分类：英语 2014-10-07