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by sridharnie
Fri Oct 15, 2010 1:29 pm
 
Forum: GMAT Official Practice Test Verbal
Topic: Ozone reaches high concentrations twelve miles
Replies: 35
Views: 17841
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Re: Ozone reaches high concentrations twelve miles

Ron,

Could you please explain how "had" is correct over "has"?

Suppose the answer options were the following:

D) had long appeared immune to
E) has long appeared immune to

How to decide which one is the correct usage?