新东方小蓝上的一道题，帮忙看看怎么解

23. 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,

(E) which is believed to be

答案是C，请NN解释一下。

这题我是这么想的：

首先看句子类型：

N，N1（主语）+谓语，

首先看A：believe应该也是并列的谓语，所以2个动词并列谓语，需要加and。。

B：that不能单独指代一个独立的句子，还有句子后面是ever seen，所以这个be的动作是发生在believe之前的。。

C：对

D：which就近指代有嫌疑

E：同理。

thanks,Dear!

A huge flying reptile that died out with the dinosaurs some 65 million years ago,

 the Quetzalcoatlus had a wingspan of 36 feet,  

and it is believed to have been the largest flying creature the world has ever seen.

the world has ever seen 是修饰前面的creature吗？省略了That?

是的。。