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Manager
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work .. [#permalink] New post 30 May 2004, 16:47
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The work of mathematician Roger Penrose in the early 1970s, on the geometry of what are called aperiodic tiles, turned out to describe the architecture of a previously unknown class of crystals.
(A) what are called aperiodic tiles, turned out to describe
(B) what is called aperiodic tiles, describes
(C) aperiodic tiles, describing
(D) so-called aperiodic tiles, describe
(E) aperiodic tiles, it turned out to describe

Plz explain

Thanks
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 [#permalink] New post 31 May 2004, 05:28
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here work (a singular subject)

"describes" a singular verb is correct one

so C,Dare out.

Only A,B,E are contenders..

E - totally wrong and awkward no logical referrent for "it"

B - what is called aperiodic tiles

subject and verb does not agree in this line

so only A is left.

which is best choice in this case
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 [#permalink] New post 31 May 2004, 13:13
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describe is not a vern here.

turned out - is the verb. In the past tense there is no plural/singular verb.

A is the best choice.

Get rid of all the things after the comma and you will be left with the following.

The work of mathematician Roger Penrose in the early 1970s turned out to describe the architecture of a previously unknown class of crystals.

The phrase after the comma should either be

on the geometry of what are called aperiodic tiles

or

on the geometry of what is called the aperiodic tile
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Re: work .. [#permalink] New post 31 May 2004, 14:10
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singh_satya wrote:
The work of mathematician Roger Penrose in the early 1970s, on the geometry of what are called aperiodic tiles, turned out to describe the architecture of a previously unknown class of crystals.
(A) what are called aperiodic tiles, turned out to describe
(B) what is called aperiodic tiles, describes
(C) aperiodic tiles, describing
(D) so-called aperiodic tiles, describe
(E) aperiodic tiles, it turned out to describe

Plz explain

Thanks


A is correct

if "what" is used it has to follow with are as what refers to tiles
"describe" refers to "The Work" so it has to be "describes", unless used as an infinitive "to describe"
Only A satisfies the aforementioned statements!
Re: work ..   [#permalink] 31 May 2004, 14:10
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