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# Art historians are using a process known as infrared

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GMAT Club Legend
Joined: 15 Dec 2003
Posts: 4288
Art historians are using a process known as infrared [#permalink]

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09 Sep 2004, 19:21
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Art historians are using a process known as infrared scanning in analyzing the Mona Lisa to determine if it has been altered since completion and if Leonardo da Vinci first sketched the figure in black, as done by many artists of the time.

A) if it has been altered since completion and if Leonardo da Vinci first sketched the figure in black, as done
B) if it had been altered since completion and if Leonardo da Vinci first sketched the figure in black, a practice employed
C) whether it has been altered since completion and whether Leonardo da Vinci first sketched the figure in black, a practice employed
D) whether it was altered since completion and whether Leonardo da Vinci first sketched the figure in black, as was done
E) whether it had been altered since completion and whether Leonardo da Vinci first sketched the figure in black, a practice done
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Best Regards,

Paul

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Joined: 05 Sep 2004
Posts: 97

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09 Sep 2004, 19:52
An easy fluke. Yes, C sounds the best.
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Joined: 05 May 2004
Posts: 574
Location: San Jose, CA

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10 Sep 2004, 00:01
C for sure

K_s_r wrote:
Can some on explain why it cannot be D

D) whether it was altered since completion and whether Leonardo da Vinci first sketched the figure in black, as was done

since is always associated with present perfect.
since means starting at a specific past and continuing till now
GMAT Club Legend
Joined: 15 Dec 2003
Posts: 4288

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10 Sep 2004, 05:19
OA is C. Nice job guys. This proves that "whether" is always prefered over "if". Remember that for your GMAT exam.
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Best Regards,

Paul

10 Sep 2004, 05:19
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