大全8

大全8 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

我选的是B, 答案是C，不大明白为什么是C，请各位高手指教一下！

21. A proposal has been made to trim the horns from rhinoceroses to discourage poachers;the question is whether tourists will continue to visit game parks and see rhinoceroses after their horns are trimmed.

a)whether tourists will continue to visit game parks and see rhinoceroses after their horns are

c)whether tourists will continue to visit game parks and see rhinoceroses once the animal's horns have been

我选的是A，正确答案是C

第一题。the world has ever seen 是个特殊的时间状语从句。要用现在完成时。记住就行。

第二个。their 指代不清。换成the animal's就很清楚了。