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【題目】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】試題分析：

a knowledge of: 某一方面的知識；trade 為不可數(shù)名詞，表示泛指時不用冠詞。

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