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

问题补充：

Many people agree that knowledge of English is a must in

international trade today.

A. a; 不填

B. the; an

C. the; the

D. 不填; the

答案：

(答案→)A. a; 不填

B. the; an

C. the; the

D. 不填; the

解析：本题考查冠词。a knowledge of指某一方面的知识；international trade国际贸易,不是特指 不用加定冠词。