[讨论]请教一道GWD的题

菁菁姑娘

 

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 99percent 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.

  这是GWD上的一道语法 我选的B 答案是E

  想问问NN们 为什么five hundred million的出现也要使用完成时呢？我觉得应该是一般过去时才对 强调他们是过去存在的 然后99%灭绝了的物种才用have vanished 表示已经发生

  谢谢～～

 

zouyochin

the 500 million里的the很重要，表示特指在地球上出现过的那500万个物种，而不是其他的物种。

菁菁姑娘

以下是引用zouyochin在2009/8/20 16:25:00的发言：
the 500 million里的the很重要，表示特指在地球上出现过的那500万个物种，而不是其他的物种。

恩恩 还真没看到这个差别

那么时态有问题么 这个地方为什么用完成时我不太懂 谢谢哈

zouyochin

这个这个，我也不太清楚，呼唤NN

lijiahui0422

I've been to paris.到现在为止我去过paris,不代表我现在也在paris.

creatures have appeared on earth.应该同理吧，个人理解，做个参考吧`