GWD13-Q39讨论

Q39: GWD15

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.

答案目前两个版本：E和B;

为啥不选A呢？是否把them改成those 就可以选了？99percent of ……vanishing 应该算是n+v.ing的独立主格结构吧

those this that 不能和介词搭配，没有具体指代啊，问题是出在THEM上，指代不明啊，A如果不改结构肯定不对