The European Union universities are most attractive because they have diversity of cultures and teaching methods.
A. the , a
B. a , a
C. a , the
D. the , the
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(答案→)A. the , a
B. a , a
C. a , the
D. the , the
解析：
试题分析: 考查冠词用法。由most attractive可知此处形容词是最高级，形容词最高级前应该用定冠词the；而a diversity of是固定短语“多种多样的”。句意：欧洲联盟大学是最有吸引力的，因为他们有多元的文化和多种教学方法。