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 很多人一致認(rèn)為一個(gè)民族的文化是交流和貿(mào)易的一種必要的手段.

解答 答案 D.a(chǎn) nation'culture指一個(gè)民族的文化,a must指一種必要的方法.

點(diǎn)評(píng) 屬于考察冠冠詞a表示一個(gè).泛指,這是a的基本用法.還考察must 做名詞表示必須做的事.

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