从that的省略现象聊一聊语法

原文:http://mp.weixin.qq.com/s?__biz=MzA4MDYyMTcxOA==&mid=2651255922&idx=1&sn=d858490ceda9d5ba84d3f2775e1760ad&chksm=84532d8bb324a49d95006f70f33cbed9541a7dc137dfc086049e2e91aa62f3053ed473c00633#rd