gmat语法求解释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 emis

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gmat语法求解释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 emis

gmat语法求解释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 emis
gmat语法求解释
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
为什么wordy啊?

gmat语法求解释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 emis
appear 这个动词的定义之一,“被视为（be perceived）”,正是在这条长句中应当被理解的意思.
在这个前提下,后面直接跟形容词 immune to 即可.
答案应该选 （D）

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