Many people agree that knowledge of English is must in international trade today

游客2024-11-30 6

问题 Many people agree that knowledge of English is must in international trade today.

选项

答案 ∧knowledge—a

解析 knowledge虽然是不可数名词，但是在固定用法“a knowledge of sth．”中表示“对……略知一二”。

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