A huge flying reptile that died out with the dinosaurs some 65 million years ago, the Quetzalcoatlus had a wingspan of 36 feet,

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问题 A huge flying reptile that died out with the dinosaurs some 65 million years ago, the Quetzalcoatlus had a wingspan of 36 feet, ________ to have been the largest flying creature the world has ever seen.

选项 A、what is believed
B、that is believed
C、which is believed
D、and it is believed

答案D

解析 本题考查并列句。分析句子结构可知,空前的句子是完整的主谓宾结构,而逗号不能隔开两个句子,故空格处应填入并列句、定语从句或状语从句。D项表示and连接并列句,其中主语it指代Quetzalcoatlus,谓语是被动语态,句子结构完整,句意完整,故答案为D项。what引导名词性从句;that一般不引导非限制性定语从句;which可以引导非限制性定语从句,但which用在此处指代不明,故排除其他三项。
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