英语 Possibly the greatest advance in __ material came with th

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/25 12:08:29

英语
Possibly the greatest advance in __ material came with the invention of a cheap way to make steel.
1.bridge-building 2.building of bridges
3.building a bridge 4.bridges are built
该选哪个呢?ing是动名词形式,所以123貌似都对啊

1,因为bridge-building 是形容material的起形容词作用,其他都不可以.

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