and so 和 so that 的用法.

题目

and so 和 so that 的用法.
Fabric was very expensive in the USA before the Industrial Revolution,and so scraps were saved and recycled into such items as patchwork quilts and doll clothes.
VS
Fabric was very expensive in the USA before the Industrial Revolution and so that scraps were saved and recycled into such items as patchwork quilts and doll clothes.
哪个对?为什么?THANKS

答案

布类在美国工业革命之前很贵,因此细碎的布都被节约回收做成棉被及布娃娃之类的东西
and so 是副词,因此的意思,在句中是可以的,so that 是连词,因此,所以,而and 也是连词,[连接并列的名词、代词或数词,
所以第二个不对,可以直接把that去掉