大全8, 帮忙啊!!!

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

大全给的答案是C, 可为什么不是A呢? 求救!!!谢谢.

哦,谢谢了!!!

我基础比较差，谁能说的详细点？

逗号＋ED，什么被相信？A huge flying reptile ？还是就近的wingspan of 36 feet？C用了个and，表并列，and连接两个事务前面不能加逗号，那么中间那句 the Quetzalcoatlus had a wingspan of 36 feet明显插入语修饰A huge flying reptile。

原句就是
                    A huge flying reptile that died out with the dinosaurs some 65 million years ago and it is believed to have been the largest flying creature the world has ever seen。

我时这样理解的，如有错误甚至误导，请大家坚决指出，造福大家，提高自我，谢谢谢

同意楼上lcy19812000的说法，rock19840717对主句的理解是有偏差的。

 A huge flying reptile 只是前置的同位语，