PREP2-Q8

evelyn205205 · 发表于 2011-6-27 22:26:36

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 chlorofluorocarbons deplete the ozone layer.

(A) has long appeared that it was immune from

(B) has long appeared to have been immune from

(C) has long appeared as being immune to

(D) had long appeared immune to

(E) had long appeared that it was immune to

答案是D。为什么无端要用过去完成时？

在GMAT语法中，不是没有特别的说明，就不要过去完成时的嘛？

evelyn205205 · 发表于 2011-6-28 09:38:57

顶！

evelyn205205 · 发表于 2011-6-28 10:47:12

有谁能帮帮我？？？

evelyn205205 · 发表于 2011-6-28 12:18:30

顶顶！

evelyn205205 · 发表于 2011-6-28 15:43:25

对过去完成时的使用表示不理解啊

evelyn205205 · 发表于 2011-6-28 16:18:01

我想问问：
如果选项C中，has long appeared as being immune to改成has long appeared to be immune to是不是就对了。
谢谢，期待NN们帮忙答疑解惑。

evelyn205205 · 发表于 2011-6-28 20:53:59

？？？

evelyn205205 · 发表于 2011-6-28 21:38:59

如果选项C中，has long appeared as being immune to改成has long appeared to be immune to是不是就对了。
这个问题总该帮我一下拉~

Jason102 · 发表于 2011-7-21 11:13:50

以为找到了解释没想到都是LZ自顶的。。。

evelyn205205 · 发表于 2011-7-21 11:21:52

以为找到了解释没想到都是LZ自顶的。。。

-- by 会员 Jason102 (2011/7/21 11:13:50)

呵呵，继续期待NN吧

PREP2-Q8

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