问题描述：
关于原因状语从句语法的问题.
There was such a long line at the exhibition 空格 we had to wait for about half an hour.
填 that.
但还有一个选择是 so.我觉得是so啊.为什么呢、
There was such a long line at the exhibition 空格 we had to wait for about half an hour.
填 that.
但还有一个选择是 so.我觉得是so啊.为什么呢、
问题解答：
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