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

why c? i choose a

world has ever seen提示用完成时，只能选C了。

在GMAT里，that不能单独使用，只能用于that car, that number 之类的形式。