A huge flying reptile that died out with thedinosaurs some 65 million years ago, the Quetzalcoatlus had a wingspan of 36feet, believed to be the largest flying creature the world has everseen.
(A) believed to be
(B) and that is believed to be
(C) and it is believed tohave been
(D) which was, it is believed,(C)
(E) which is believed to be
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看句子本身的意思, 是这一事实有到现在为止是世界上所见的最大的飞禽的意思,所以用现在完成时. 不知道解释的对不对.
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