Today, after more than 50 years of development, the College of Europe has not only served as ______ important think tank for the European Union but also become_____cradle of political elites of Europe.

A．an, the

B．the;an

C．the, the

D．an；/

科目 英语   题型 单选题   难度 中等

知识点： 冠词的用法辨析