Biologists at Northern Laboratory have found an ancient : GMAT Sentence Correction (SC)
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# Biologists at Northern Laboratory have found an ancient

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Biologists at Northern Laboratory have found an ancient [#permalink]

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25 Feb 2004, 15:59
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Biologists at Northern Laboratory have found an ancient microscopic plant parasite, one that they assume of a type previously unknown to threaten plants.

A that they assume of
B that they assume is
C that they assume it to be
D they assume that it is of
E they assume to be of

Vivek.
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25 Feb 2004, 16:02
E is good.

"one that" is considered redundant in GMAT land
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26 Feb 2004, 07:40
Agree with the concensus, E. Confused me a bit with the last "a" in original sentence bolded
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26 Feb 2004, 15:59
In this example that is unnecessary, the pronoun one adequately refers to a microscopic plant parasite. Because the sentence refers to something that existed a long time ago, but has only been documented of late, to be is more appropriate than is. Is is in the present tense, and it is best to find an answer choice that encompasses both the past and present - the infinitive to be does this better. After eliminating that and is, we are left with choice E. This question has an assumption,(they assume), in effect it is not a fact. If we follow this reasoning through, to be a type is stating fact, whereas to be of a type is not quite as emphatic, it is an assumption.

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