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realme923

前辈们的总结已很清楚的解决了这题。另外，我认为还有一点需要补充。

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

(C) and it is believed to have been

 

原本觉得排除C的原因是wordy,选A。但后来觉得不是这么回事。读下这句话，首先是独立主格A huge flying reptile that died out with the dinosaurs some 65 million years ago，来修饰主语。后面的believed虽然有修饰歧异，但通常可优先修主语（分词跳跃修饰），这样一来，整句话显得不伦不类，“独立主格，主谓宾，分词结构修饰主语”，不符合常规order。所以，为了结构清楚，易将一句话拆成并列句。

 

至于时态问题，至今还模棱两可中,比如businessweek中找到的下面这句话。未必需要皆完成时

This is a period like none of us has ever seen before.

[此贴子已经被作者于2008-10-20 0:00:45编辑过]