Five hundred million different species of living creatures have appeared on Earth, nearly

99 percent of them vanishing.

A. Five hundred million different species of living creatures have appeared on Earth,

nearly 99 percent of them vanishing.

B. Nearly 99 percent of five hundred million different species of living creatures that

appeared on Earth have vanished.

C. Vanished are nearly 99 percent of the five hundred million different species of

living creatures that appeared on Earth.

D. Of five hundred million different species of living creatures that have appeared on

Earth, nearly 99 percent of them have vanished.

E. Of the five hundred million different species of living creatures that have

appeared on Earth, nearly 99 percent have vanished.

第一感觉是想选E的，觉得B里面的过去时和现在完成时连用不对。而E里面的Of ... , xx percent ...是个常见句式。

不过想想E时态也是有问题的，appear和vanish都用了现在时，好像是在appear的同时就vanish了。

paopao不选B的理由是什么呢？

还是不太明白