GWD15-Q39

niceday

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.

欧选D, 答案B, 求解
我觉得因为出现在地球的生物，有些现在也存在着，所以应该是have appeared呀

suwendao

where is NN?

help to answer this question

qyyzltq

支持B。

qyyzltq

以下是引用niceday在2007-10-5 21:11:00的发言：

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.

欧选D, 答案B, 求解
我觉得因为出现在地球的生物，有些现在也存在着，所以应该是have appeared呀

存在是存在，我觉得已经用百分比说明了，其他不存在的是说明的重点。

open to discuss!