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rajarams
The Leakeys discovered Homo habilis, the first tool user, with two teeth found at Olduvai Gorge in Tanzania.

A. Homo habilis, the first tool user, with two teeth found
B. Homo habilis, the first tool user, with teeth that were found
C. When teeth of Homo habilis , the first tool user, were found
D. Homo habilis, due to two teeth found of the first tool user
E. Homo habilis, the first tool user, when two teeth were found

The Leakeys discovered Homo habilis, the first tool user, when two teeth were found at Olduvai Gorge in Tanzania.

IMHO (E) for the highlighted errors in the other options...
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For A and B: We can't stack two modifiers in a row if they're modifying the same thing.

medieval-monks-through-their-manuscript-illuminations-144024.html
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The Leakeys discovered Homo habilis, the first tool user, with two teeth found at Olduvai Gorge in Tanzania.

A. Homo habilis, the first tool user, with two teeth found ==> Implies that the discovery was done with the help of two teeth, this makes the sentence awkward and non-sensical.

B. Homo habilis, the first tool user, with teeth that were found ==> Implies that the discovery was done with the help of teeth, this makes the sentence awkward and non-sensical.

C. When teeth of Homo habilis, the first tool user, were found ==> Modifer error - makes the sentence illogical

D. Homo habilis, due to two teeth found of the first tool user ==> "Due to" incorrect IDIOM here

E. Homo habilis, the first tool user, when two teeth were found ==> CORRECT
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I have a question. Why "when" in E is tolerable? I remember that kaplan says "when" is strictly used for time only.
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aaba
I have a question. Why "when" in E is tolerable? I remember that kaplan says "when" is strictly used for time only.

In option E "when" is referring to time - Two teeth were found; at the same time, the Leakeys discovered Homo habilis.
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