请教大全第8题

lena_go

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,

(E) which is believed to be

答案c 那it代表的是什么,为什么用现在完成时呢,B和A为什么不行呢

mimixiaxia

it 指代the Quetzalcoatlus ，用现在完成时是因为短语：the world has ever seen

andy7788

 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.