Ozone, a special form of oxygen that screens out harmful

lainemai · 发表于 2014-10-16 19:36:50

Ozone,a special form of oxygen that screens out harmful ultraviolet rays, reacheshigh concentrations twelve miles above Earth, where it has long appearedthat it was immune from human influence; we have now realized, though, thatemissions of industrial chlorofluorocarbons deplete the ozone layer.

A haslong appeared that it was immune from

B haslong appeared to have been immune from

C haslong appeared as being immune to

D hadlong appeared immune to

E hadlong appeared that it was immune to

想了解这道题为什么正确选项要有过去完成时出现？求大神粗线~~谢谢~~

leohhy · 发表于 2014-10-16 19:49:32

Ozone,a special form of oxygen that screens out harmful ultraviolet rays, reaches high concentrations twelve miles above Earth, where it has long appeared that it was immune from human influence; we have now realized, though, that emissions of industrial chlorofluoro carbons deplete the ozone layer.

A has long appeared that it was immune from
>>>wrong idiom, appear immune to sb.; wrong tense
B has long appeared to have been immune from
>>>wrong idiom, appear immune to sb.; wrong tense
C has long appeared as being immune to
>>> wrong idiom, appear immune to sb.; wrong tense
D had long appeared immune to
>>>correct.
>>>The context tells us that the idea Ozone is immune to human influence is wrong. That's the reason past perfect tense is used.
E had long appeared that it was immune to
>>>wrong idiom, either to use "it(logical subject) appears that..." or " appear adj. to sb./sth."

lainemai · 发表于 2014-10-16 20:03:04

leohhy 发表于 2014-10-16 19:49
Ozone,a special form of oxygen that screens out harmful ultraviolet rays, reaches high concentration ...

context并没有tells us。。。是错的啊，你从哪里看出来的啊？

leohhy · 发表于 2014-10-16 20:37:39

lainemai 发表于 2014-10-16 20:03
context并没有tells us。。。是错的啊，你从哪里看出来的啊？

， context这整句话是我讲给你听的，不是原文的话。
原文“we have now realized, though, that emissions of industrial chlorofluorocarbons deplete the ozone layer.“，从now realized，though，这些词可以知道，第一句话的内容现在已经不成立了。

lainemai · 发表于 2014-10-17 15:30:29

leohhy 发表于 2014-10-16 20:37
， context这整句话是我讲给你听的，不是原文的话。
原文“we have now realized, though, that emissi ...

不是啦，我的意思是说你后面的话。。。在原文没有体现啊，没有体现immune to human是错的啊

leohhy · 发表于 2014-10-17 16:30:21

lainemai 发表于 2014-10-17 15:30
不是啦，我的意思是说你后面的话。。。在原文没有体现啊，没有体现immune to human是错的啊
...

第一句话说了Ozone ....immune to human influence;
第二句话说了industrial carbons deplete the ozone layer.
这不是清晰的告诉我们其实Ozone并不immune to human influence么？

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