一道sat很简单的语法题!

问题描述:

一道sat很简单的语法题!
Fabric was very expensive in the United States before the industrial scraps were saved and recycled into such items as patchwork quilts and doll clothes.
C.Revolution,and so
D.Revolution and so that
我选了D请问有什么区别?

so that 已有连接的作用在这里用了就不需 and所以 and so that便不好 况且如在这里用so that原句宜改为Fabric was so expensive in the United States before the Industrial Revolution that scraps were saved and...