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Unless the conservator can find a way to protect the photographs in th

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Unless the conservator can find a way to protect the photographs in th [#permalink]

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New post 13 Mar 2017, 00:40
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

73% (00:38) correct 28% (00:35) wrong based on 40 sessions

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Source: McGraw Hill GMAT

Unless the conservator can find a way to protect the photographs in the archives from light and air, these precious historical documents have deteriorated and will continue to do so both in color and in fine detail.

A. have deteriorated and will continue to do so
B. will continue to deteriorate
C. have been and will continue to deteriorate
D. will continue to deteriorate, as they already have,
E. will be deteriorating yet more
[Reveal] Spoiler: OA

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Re: Unless the conservator can find a way to protect the photographs in th [#permalink]

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New post 13 Mar 2017, 06:30
The underlined portion of the sentence is describing a possible situation in the future -- that is, a situation that *will* occur unless the conservator finds a way to preserve the photographs.

The past perfect (has deteriorated) is used to describe actions that began in the past and the are continuing into the present. In this case, there is no need to refer to the past at all.

Here are some common tense "templates:"

-If x happens, y will occur
-Unless x happens, y will occur
-Since 1950, x has been occurring...
-For x number of years, y has been occurring...

Note that the real GMAT does not normally combine tenses improperly in quite this way. Most often, the future is incorrectly replaced with the present, e.g. "Unless the conservator can find a way to protect the photographs in the archives from light and air, these precious historical documents continue to deteriorate both in color and in fine detail.
Re: Unless the conservator can find a way to protect the photographs in th   [#permalink] 13 Mar 2017, 06:30
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