1. A huge flying reptile that died out with the dinosaurs some 65 million years ago, the Quetzalcoatlus had a wingspan of 36 feet, believed to be the largest flying creature the world has ever seen.
(A) believed to be
(B) and that is believed to be
(C) and it is believed to have been
(D) which was, it is believed,(C)
(E) which is believed to be
C中的it在这里一定指代前面一个句子的主语Quetzalcoatlus吗,会不会有歧义,谢谢!
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