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20.Most people agree that knowledge of ___ nation's culture is __ must in trade or communication.(  )
A.the;/B./; theC./; aD.a; a

分析 很多人一致认为一个民族的文化是交流和贸易的一种必要的手段.

解答 答案 D.a nation'culture指一个民族的文化,a must指一种必要的方法.

点评 属于考察冠冠词a表示一个.泛指,这是a的基本用法.还考察must 做名词表示必须做的事.

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