GWD31-15-39

Q39:

Five hundred million different species of living creatures have appeared on Earth, nearly 99 percent of them vanishing.

1. Five hundred million different species of living creatures have appeared on Earth, nearly 99 percent of them vanishing.
2. Nearly 99 percent of five hundred million different species of living creatures that appeared on Earth have vanished.
3. Vanished are nearly 99 percent of the five hundred million different species of living creatures that appeared on Earth.
4. Of five hundred million different species of living creatures that have appeared on Earth, nearly 99 percent of them have vanished.
5. Of the five hundred million different species of living creatures that have appeared on Earth, nearly 99 percent have vanished.

   Answer: E

E中appear的时态对吗，B又错在哪里呢

appare肯定发生在vanish之前，不可能appare用过去时，vanish用现在完成时。几项中E的时态最合理