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二、单项填空(本节有10小题,每小题1分,共10分)
21. Many people agree that ______ knowledge of English is a must in ______ international trade today.

A.a; 不填 B.the; an C.the; the D.不填; the
科目 英语   题型 单选题   难度 较易
知识点: 冠词的用法辨析
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