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Scientists are currently trying to determine the extent to

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Scientists are currently trying to determine the extent to [#permalink]

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Scientists are currently trying to determine the extent to which tectonic plates have been shifted from their previous positions by earthquakes and other similar phenomena.

A. to which tectonic plates have been shifted
B. to which tectonic plates have shifted
C. of the shift of tectonic plates
D. of tectonic plate shifting
E. that tectonic plates have been shifted

PLEASE EXPLAIN ANSWERS.
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Director
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New post 23 Feb 2006, 03:22
hm...

the by indicates that we need passive voice, so either A or E in this case

I think it's E
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New post 23 Feb 2006, 03:49
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A it is for sure.

'by' suggests the sentence is in passive voice hence 'have been shifted............. by '
the plates have been shifted BY THE earthquake,therefore A.
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New post 23 Feb 2006, 05:03
The scientists are presently determining .... something that begun in the past and has been continuing... due to some reason.
Requires a present perfect continous... "Have Been"
and hence it is A.
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New post 23 Feb 2006, 05:03
but why co you choose "the extent to which", rather than "extent that" ?
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New post 23 Feb 2006, 07:19
B) is wrong cause tectonic plates can not move by themselves
hope that helps
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New post 23 Feb 2006, 08:02
El Torro wrote:
The scientists are presently determining .... something that begun in the past and has been continuing... due to some reason.
Requires a present perfect continous... "Have Been"
and hence it is A.


arriba arriba el toro!! Nice explanation :-D

Choose (A) and click confirm...
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New post 23 Feb 2006, 13:29
another one for A

Extent to is the correct idiom, extent of and extent that are incorrect.
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New post 23 Feb 2006, 14:01
GMATT73 wrote:
El Torro wrote:
The scientists are presently determining .... something that begun in the past and has been continuing... due to some reason.
Requires a present perfect continous..
. "Have Been"
and hence it is A.


arriba arriba el toro!! Nice explanation :-D

Choose (A) and click confirm...


If this is the case (Bold part above), then shouldn't we be using "have been shifting"???

I think BG is right on target. B) is wrong cause tectonic plates can not move by themselves.

BTW OA is A.
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New post 24 Feb 2006, 14:16
I think its A

i agree with ps_dahiya, 'have been' is needed because, as mentioned before, the plates are being shifted by earthquakes, they are not sifting themselves.. i dont think 'have been' is needed here because of the explanation given by el torro.

El Torro wrote:
The scientists are presently determining .... something that begun in the past and has been continuing... due to some reason.
Requires a present perfect continous... "Have Been"
and hence it is A.
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New post 26 Feb 2006, 02:22
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A

A. to which tectonic plates have been shifted
--> correct the plates are shifted by something else....
B. to which tectonic plates have shifted
--> gives impression that tectonic plates are shifting by themselves
C. of the shift of tectonic plates
--> I agree... "extent of" not correct
D. of tectonic plate shifting
--> I agree... "extent of" not correct
E. that tectonic plates have been shifted
--> I agree... "extent that" not correct
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Re: Scientists are currently trying to determine the extent to [#permalink]

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New post 24 Jun 2014, 09:56
Hello from the GMAT Club VerbalBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: Scientists are currently trying to determine the extent to [#permalink]

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New post 05 Aug 2015, 00:41
Hello from the GMAT Club VerbalBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
Re: Scientists are currently trying to determine the extent to   [#permalink] 05 Aug 2015, 00:41
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