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
我对选C没有疑问, 但我想知道and 后的并列是不是和主句had a winspan....的并列, 如果是为什么没有省略主语
请大牛指教
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