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【题目】Many people agree that ______ knowledge of English is a must in _______ international trade today.

A.the, an B.a, 不填

C.the, the D.不填, the

【答案】B

【解析】

试题分析:

a knowledge of: 某一方面的知识;trade 为不可数名词,表示泛指时不用冠词。

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