45. Quasars, at billions of light-years from Earth the most distant observable objects in the universe, believed to be the cores of galaxies in an early stage of development. (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
C选项的解释没有看懂,哪个大NN来解释一下?
C The clause some believe them to be does not supply a verb to accompany quasars as the subject of the sentence, and the clause supplies an object them so that quasars cannot be the object, making the sentence ungrammatical.
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