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
人气：154 ℃ 时间：2020-03-29 17:22:40
解答
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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