2. 外语
  3. Many people agree that knowledge of English is must in international trade today.

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

admin2014-09-17  46
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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