Many people agree that knowledge of English is a must in international trade today.
A. a；／
B. the；an
C. the；the
D. ／；the
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(答案→)A. a；／
B. the；an
C. the；the
D. ／；the
解析：此题重点考查冠词搭配。knowledge是个不可数名词，但a knowledge of为固定搭配，表示“某方面的知识”。“国际贸易”是抽象名词，前面不加冠词。