Which do you think is the first ____ in the world?----Computer,I think Amost uesful B useful

题目

Which do you think is the first ____ in the world?----Computer,I think Amost uesful B useful

答案

答案：A.
翻译：--你认为哪个是世界上最有用（第一有用）的?--我认为是电脑.
A是一个固定搭配：the + 序数词 + 形容词最高级 + 名词,意思是“第几最...的...”,有时如果不影响理解,后面的名词可以省略不写.
但是没有B这种没有最高级而直接使用序数词加形容词,而后面没有名词的结构.
再如：The Yangtze River is the third longest (river) in the world.
长江是世界第三长（河）.
如果你满意我的答案,这是对我们答题者劳动的尊重,多谢!