二、单项填空（本节有10小题，每小题1分，共10分）21.M

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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

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