题目内容

(2013·嘉兴一中月考)Many people agree that ________ knowledge of English is a must in ________ international trade today.
A.the;anB.a;/C.the;theD./;the
B
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。
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