2. 外语
  3. Quasars, at billions of light-year from Earth the most distant observable objects in the universe, believed to be the cores of g

Quasars, at billions of light-year from Earth the most distant observable objects in the universe, believed to be the cores of g

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问题 Quasars, at billions of light-year from Earth the most distant observable objects in the universe, believed to be the cores of galaxies in an early stage of development.
选项 A、believed to be
B、are believed to be
C、some believe them to be
D、some believe they are
E、it is believed that they are
答案B
解析 此句缺谓语动词，因此C、D、E结构全错，A中用主动语态错，应换为B中的被动语态。本句为believe to be的用法。
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