Many people agree that knowledge of English is a must in international trade today.Aa

问题补充：

Many people agree that knowledge of English is a must in international trade today.

Aa; /

B. the; an

C. the; the

D. /; the

答案：

(答案→)A. a; /

B. the; an

C. the; the

D. /; the

解析：考查冠词。第一空是固定词组a knowledge of English指掌握了英语；第二空中的名称trade是一个抽象名词，前面不需要使用冠词。句意：很多人都同意掌握英语在今天的国际贸易中是一个必须的事情。故A正确。