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Scientists have dated sharp-edged flakes of stone found in [#permalink]
 03 Sep 2007, 20:47
Question Stats:
51% (01:42) correct
48% (00:39) wrong based on 7 sessions
Scientists have dated sharp-edged flakes of stone found in the fine-grained sediments of a
dry riverbed in the Afar region of Ethiopia to between 2.52 and 2.60 million years ago,
pushing back by more than 150,000 years the earliest date when it is known that humans
made stone tools.
A. when it is known that humans made
B. at which it is known that humans had made
C. at which humans are known to have made
D. that humans are known to be making
E. of humans who were known to make
[/u]
I would think the answer should be E. ??
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Re: SC - Scientist [#permalink]
04 Sep 2007, 01:33
alimad wrote: Scientists have dated sharp-edged flakes of stone found in the fine-grained sediments of a
dry riverbed in the Afar region of Ethiopia to between 2.52 and 2.60 million years ago,
pushing back by more than 150,000 years the earliest date when it is known that humans
made stone tools.
A. when it is known that humans made
B. at which it is known that humans had made
C. at which humans are known to have made
D. that humans are known to be making
E. of humans who were known to make
[/u]
I would think the answer should be E. ??
C,
.........date at which something is known to .....is correct idiom
f.e: date at which the portrait is known to have been sold...
E is unidiomatic, completely.
we can say date of event {birth, death...test} f,e: we can say date of his {her, Ann`s} birth, but 'date of ' is not used directly with people or living things.
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Re: SC - Scientist [#permalink]
18 Nov 2009, 19:58
alimad wrote: Scientists have dated sharp-edged flakes of stone found in the fine-grained sediments of a
dry riverbed in the Afar region of Ethiopia to between 2.52 and 2.60 million years ago,
pushing back by more than 150,000 years the earliest date when it is known that humans
made stone tools.
A. when it is known that humans made
B. at which it is known that humans had made
C. at which humans are known to have made
D. that humans are known to be making
E. of humans who were known to make
[/u]
I would think the answer should be E. ?? A wrong tense.. Have dated so have made should be used instead of had made.. Also it seems to refer to scientists B Had made suggested that it is not being done any more.Also it seems to refer to scientists C correct --have dated and have made llel and earliest date at which - idiomatically correct D to be making wrong tense and idiom E humans who were known - changes meaning and also wrong tense
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Re: SC - Scientist [#permalink]
01 Dec 2009, 08:23
alimad wrote: Scientists have dated sharp-edged flakes of stone found in the fine-grained sediments of a
dry riverbed in the Afar region of Ethiopia to between 2.52 and 2.60 million years ago,
pushing back by more than 150,000 years the earliest date when it is known that humans
made stone tools.
A. when it is known that humans made
B. at which it is known that humans had made
C. at which humans are known to have made
D. that humans are known to be making
E. of humans who were known to make
[/u]
I would think the answer should be E. ??  Can anyone please explain all the option of this question? 
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Re: SC - Scientist [#permalink]
01 Dec 2009, 08:53
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Dated at or Date at is correct idiom , so A,D, E are out in B, "it" is ambiguous; C looks better hence C
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Re: SC - Scientist [#permalink]
01 Dec 2009, 09:08
srini123 wrote: Dated at or Date at is correct idiom , so A,D, E are out
in B, "it" is ambiguous;
C looks better
hence C Thanks Srini 
Last edited by swatirpr on 02 Dec 2009, 20:27, edited 1 time in total.
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Re: SC - Scientist [#permalink]
31 Jul 2010, 20:44
I am with C as well. Whats the OA? Please share the OA
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Re: SC - Scientist [#permalink]
02 Aug 2010, 09:41
OA is C.
good question though. quite difficult to remember all the idioms.
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Re: SC - Scientist [#permalink]
02 Aug 2010, 10:26
date at which is the correct idiom.. Hence C
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Re: Scientists have dated sharp-edged flakes of stone found in [#permalink]
28 Jan 2012, 11:13
Could someone please explaine "Have made" in C?
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Re: Scientists have dated sharp-edged flakes of stone found in [#permalink]
06 May 2012, 13:51
Runner2 wrote: Could someone please explaine "Have made" in C? I have the same question. as per previous discussions, "have made" is || with "have dated". I think it is wrong because "have dated" referes to scientists and current time, but "have made" to people who lived thousand of years ago. why is present perfect used?
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Re: Scientists have dated sharp-edged flakes of stone found in [#permalink]
07 May 2012, 18:36
alimad wrote: Scientists have dated sharp-edged flakes of stone found in the fine-grained sediments of a
dry riverbed in the Afar region of Ethiopia to between 2.52 and 2.60 million years ago,
pushing back by more than 150,000 years the earliest date when it is known that humans
made stone tools.
[/u]
I would think the answer should be E. ?? A. when it is known that humans made B. at which it is known that humans had made C. at which humans are known to have madeD. that humans are known to be makingE. of humans who were known to make : speaks about time not humans.
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Re: Scientists have dated sharp-edged flakes of stone found in [#permalink]
11 May 2012, 10:42
Code: Scientists have dated sharp-edged flakes of stone found in the fine-grained sediments of a
dry riverbed in the Afar region of Ethiopia to between 2.52 and 2.60 million years ago,
pushing back by more than 150,000 years the earliest date [u]when it is known that humans
made[/u] stone tools.
A. when it is known that humans made
B. at which it is known that humans had made
C. at which humans are known to have made
D. that humans are known to be making
E. of humans who were known to make OA:C Background: Scientists have dated sediments. They found that the pieces of sharped-edged flakes were much older than samples previously found. This sentence structure has two parts that need to be parallel. The scientists have dated and the knowledge of the earliest date at which humans are to have made... A: ...that humans made is not parallel to Scientists have dated INCORRECT B: had made is also not parallel; so can be eliminated INCORRECT C: at which humans are known to have made IS parallel to Scientists have dated CORRECT D: to be making...not parallel INCORRECT E: to make is not parallel because it is not in the PRESENT PERFECT tense INCORRECT hope this helps guys....
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Re: Scientists have dated sharp-edged flakes of stone found in [#permalink]
11 May 2012, 10:56
Quote: as per previous discussions, "have made" is || with "have dated". I think it is wrong because "have dated" referes to scientists and current time, but "have made" to people who lived thousand of years ago. have made does not refer to to the people who lived thousands of years ago; however, it is modifying the earliest known date that is currently known (i.e the current theory, that these type of tools were only made 150,000 later) Does this make sense?
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Re: Scientists have dated sharp-edged flakes of stone found in
[#permalink]
11 May 2012, 10:56
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