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Ozone

by venmic » Sun Sep 25, 2011 10:05 pm
Ozone 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
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by 1947 » Sun Sep 25, 2011 10:17 pm
B for me ...correct use of tense
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by gunjan1208 » Mon Sep 26, 2011 12:13 am
B for me too
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by GmatKiss » Mon Sep 26, 2011 6:28 am
venmic wrote:Ozone 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
Mixed between C and D
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by cyrwr1 » Mon Sep 26, 2011 9:45 am
Choice d is my pick

Had is required as we have " We have realized"

and the correct idiom is "immune to", leaving choices D and E

The sentence is trying to say: the thought of ozone had been accepted but we have now......
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by mehrasa » Mon Sep 26, 2011 12:40 pm
+1 for D
first of all "immune to" is correct idiom
since the sentence says that "we have now realized" means that realization start from the past and continue till now ==> the previous sentence is an action occuring before that ==> use "had long appeared".
on the other hand, when the underlined portion mention the subject by using "it" no need to have it again after 'had long appeared'
venmic wrote:Ozone 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
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by GmatKiss » Tue Sep 27, 2011 5:15 am
OA is D
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by navami » Tue Sep 27, 2011 11:05 am
IMO D
This time no looking back!!!
Navami
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by venmic » Fri Sep 30, 2011 12:31 am
why is B) has long appeared to have been immune from

Coorrect according to

please explain the have been usage
1947 wrote:B for me ...correct use of tense
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by GmatKiss » Fri Sep 30, 2011 9:35 am
"immune to" is the correct idiom!

He is immune to virus.
A special kind of bacteria is immune to anti-biotics.

He is immune from Virus is wrong!!

Hope you got it.

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GK
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by 1947 » Sat Oct 08, 2011 12:20 pm
But in option D is the use of HAD correct ?
I mean does it fulfill the use of past perfect tense.

Thanks
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