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# New techniques in thermal-scanning photography, a process

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10 Aug 2009, 01:30
angel2009 wrote:
Than is there in B.
Why do we require perfect tense here?
IMO B

You are right, but IMO if you look carefully you will observe that THAN in B is attached to THE EFFECTS: "the effects [...] than ever.." which makes no sense.

IMO the sentence would be equally correct with MAKE or MADE, but HAVE MADE is coherent providing that the research has been completed recently.

So the key is the subject and the placement of THAN.
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10 Aug 2009, 02:16
C is clear and concise. B unnecessarily complicates by adding a few commas

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09 Jun 2010, 06:13
I went with option B bt OA says it is C.

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09 Jun 2010, 07:09
I initially picked C but then the construction "...in greater detail than ever before the effects..." didn't sound very pleasing to me. And so I picked D...

Can anybody tell me what is wrong with D?

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09 Jun 2010, 23:16
mustdoit wrote:
can you guys please clarify as to what does "IT" refers to in option C.

have made it possible to study in greater detail than ever before the effects of calefaction, or warming, of a river

Sorry. I was watching this discussion. There is a nice discussion about the usage of "it" on this thread -

sc-australia-76438.html?highlight=SaraiGMAXonline

As explained by GMAT Instructor.

1. It can have a referrent
2. Or it can be used as expletive (place holder), which doesnt refer to anything

My 2 cents -
What we should worry about is whether "it" is ambiguous. Unless that happens don't worry too much.

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16 Jun 2010, 06:28
One way to understand why B is wrong is that B has so many commas, you can likely to eliminate immediately in Gmat since Gmat looks for short, precise and clear sentence

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04 Aug 2010, 05:03
C it should be....but pls post OA

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13 Aug 2010, 02:59
C the first time i saw the choice
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11 Oct 2010, 20:50
B) Techniques is a plural term. Obviously it requires a plural verb make.

C) Now the substance of the sentence is that new techniques made it possible in the past, make it possible presently and will make it possible in the future to study in greater detail. The right tense to denote such a day-to-day affair is the use of simple present. Hence make it possible rather than have made it possible.
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12 Oct 2010, 05:59
between B & C,
present perfect makes a better sense, however, apart from tense I can not realize how we can rule out B due to placement of comparative forms of which I'm suspicious.

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31 Oct 2010, 06:26
OA is C.
could anybody elaborate on D? (please dont say that it is awkard or wordy...)
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01 Nov 2010, 01:43
+1 for C
S-V Agreement
and choose b/n simple present Vs Present Perfect
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18 Dec 2010, 03:17
noboru wrote:
OA is C.
could anybody elaborate on D? (please dont say that it is awkard or wordy...)

noboru...I think that "it" in D has no clear reference . Ideally "it" should point to study but here the conflict is between "river" and "study" .

HTH

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18 Dec 2010, 06:12
noboru wrote:
OA is C.
could anybody elaborate on D? (please dont say that it is awkard or wordy...)

option D
Techniques make possible the study of the effects of calefaction, or warming, of a river in greater detail than it ever was before

IMO there are two issues.
ISSUE 1:
in greater detail seems to modify river rather than the study

ISSUE 2:
The Two items compared are not grammatically parallel. On the left side of the comparison, we have - the study of a river: NOUN + Prep MODIFIER. On the right side, we have - it ever was before : SUBJECT + VERB.
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04 Jun 2011, 08:08
Hi all,

I do not understand why we use "make it possible" here while "it" doesn't refer to any antecedent????

Thank you.

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13 Jun 2011, 08:37

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13 Jun 2011, 10:04
changed my mind from B to C after the explanations

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13 Jun 2011, 18:54
IMO c is not better . it doesn;t sound very well.. c--have made it possible to study in greater detail than ever before the effects of calefaction, or warming, of a river

I think the effects og calefaction of a river should follow the study. it is the object of the study.

so I think it will be better when we say that : have made it possible to study the effects of calefaction,or warming, of a river in greater detail than ever before.

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14 Jun 2011, 07:26
It is C
First of all the verb must be in agreement with the plural subject. So 'make' and 'has' are out. Only C brings in the comparison properly

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Re: New techniques in thermal-scanning photography, a process [#permalink]

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22 Jan 2012, 22:49
C is correct. Let us see why.

New techniques in thermal-scanning photography, a process that records radiation from surface areas, makes it possible to study the effects of calefaction, or warming, of a river in greater detail than ever before.

(A) makes it possible to study the effects of calefaction, or warming, of a river in greater detail than ever before
(B) make it possible to study, in greater detail, the effects of calefaction, or warming, of a river than ever before
(C) have made it possible to study in greater detail than ever before the effects of calefaction, or warming, of a river
(D) make possible the study of the effects of calefaction, or warming, of a river in greater detail than it ever was before
(E) has made it more possible than ever before to study in greater detail the effects of calefaction, or warming, of a river

New techniques is plural. Therefore makes is wrong. A,E out.
D is wrong because it is unidiomatic.
B/w B and C: The phrase
Quote:
in greater detail than ever before.
is one long modifer that should modify study, not the effects of cal... or warming.

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Re: New techniques in thermal-scanning photography, a process   [#permalink] 22 Jan 2012, 22:49

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