2. 外语
  3. Over the centuries, ______ that try to explain the origins of the university.

Over the centuries, ______ that try to explain the origins of the university.

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问题 Over the centuries, ______ that try to explain the origins of the university.
选项 A、although many theories
B、many theories
C、have many theories been
D、there have been many theories
答案D
解析
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