(·嘉兴一中月考)Many people agree that knowledge of English is a must in international trad

问题补充：

(·嘉兴一中月考)Many people agree that knowledge of English is a must in international trade today.

A. the；an

B. a；/

C. the；the

D. /；the

答案：

A. the；an

(答案→)B. a；/

C. the；the

D. /；the

解析：a knowledge of为固定表达，意义“……方面的知识”，trade为不可数名词，表示泛指时不用冠词。