Many people agree that______ knowledge of English is a must in______  international trade today. 
A．a(chǎn); 不填B．the; anC．the; theD．不填；the
A
    
試題分析:考查冠詞用法。固定短語：a knowledge of “某方面的知識，掌握”；而trade是不可數(shù)名詞，前面不用冠詞，故答案選A。句意：許多人一致認為通曉英語在當今的國際貿(mào)易中是必不可少的。
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