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Some epidemiologists believe that the Ebola virus has originated from

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Some epidemiologists believe that the Ebola virus has originated from  [#permalink]

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New post 04 Mar 2019, 23:12
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Some epidemiologists believe that the Ebola virus has originated from an animal host in a less populated region of Africa and has flourished in areas where there is more frequent contact between humans and wild animals.


A. has originated from an animal host in a less populated region of Africa and has flourished in areas

B. originated from an animal host in a less populated region of Africa and has flourished in areas

C. has originated from an animal host in a less populated region of Africa and had flourished in areas

D. originated from an animal host in a less populated region of Africa and had flourished in areas

E. originated from an animal host in a less populated region of Africa and flourished in areas

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Some epidemiologists believe that the Ebola virus has originated from  [#permalink]

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New post 04 Mar 2019, 23:22
1
aragonn generis VeritasKarishma u1983 GMATNinja AjiteshArun

I spend 5 sec to think between B/ E

Is E incorrect because ORIGINATED and FLOURISHED
can not occur at same time (as suggested by simple past tense) ?

We need HAS FLOURISHED since first the virus originated and later
flourished (the effect of flourishing) is still present in current time.
Hence B should be correct.

Is my approach correct?
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Re: Some epidemiologists believe that the Ebola virus has originated from  [#permalink]

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New post 05 Mar 2019, 03:55
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Quote:
Some epidemiologists believe that the Ebola virus has originated from an animal host in a less populated region of Africa and has flourished in areas where there is more frequent contact between humans and wild animals.


A. has originated from an animal host in a less populated region of Africa and has flourished in areas

B. originated from an animal host in a less populated region of Africa and has flourished in areas

C. has originated from an animal host in a less populated region of Africa and had flourished in areas

D. originated from an animal host in a less populated region of Africa and had flourished in areas

E. originated from an animal host in a less populated region of Africa and flourished in areas


The right answer to this question is B. The main concept being tested here is tenses, and the understanding of when we're talking about the aforementioned actions. The main actions we have to look out for are "originating" and "flourishing".

Options A&C - "has originated" is incorrect. The use of present perfect here does not work because the act of originating is a single act that happened in the past. The present perfect is used for actions that may have started in the past but are still in progress at the current reference point in the present. Hence, we can eliminate both these options. OUT

Option D - "had flourished" is incorrect. One should only use the past perfect if the action both happened in the past and stopped by the time another reference point in the past rolled around. In fact, a rule of thumb would be to never use the past perfect unless there is a later past action indicated as well. OUT

Option E - "flourished" is close. However, we want to say that the virus is still flourishing, it has been and continues to. Using the simple past indicates that this was a single action in the past, thereby altering the meaning of the sentence. OUT

Option B - gets both "originated" and "has flourished" correct, and since the others don't, is the right answer!

Always remember in SC that there is no perfect way to construct a sentence. The right answer is correct simply because the other ones are clearly wrong.

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Re: Some epidemiologists believe that the Ebola virus has originated from  [#permalink]

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New post 06 Mar 2019, 23:31
Bunuel wrote:
Some epidemiologists believe that the Ebola virus has originated from an animal host in a less populated region of Africa and has flourished in areas where there is more frequent contact between humans and wild animals.


A. has originated from an animal host in a less populated region of Africa and has flourished in areas

B. originated from an animal host in a less populated region of Africa and has flourished in areas

C. has originated from an animal host in a less populated region of Africa and had flourished in areas

D. originated from an animal host in a less populated region of Africa and had flourished in areas

E. originated from an animal host in a less populated region of Africa and flourished in areas


OFFICIAL EXPLANATION:



Step 1: Read the Sentence and Identify the Error. The series of events (has originated … has flourished) in the underlined portion points to a verb tense error. The first event is one that can occur only once (something can originate only once) and thus calls for the simple past, originated. The second event began in the past and continues into the present, so has flourished is correct.

Step 2: Eliminate All Answer Choices Containing That Error. The 2/3 split with originated/has originated allows you to eliminate choices (A) and (C).

Step 3: Look for Grammar Errors in the Remaining Answer Choices and Eliminate Them. Of the remaining answer choices, only choice (B) contains the correct tense has flourished.
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Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


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Re: Some epidemiologists believe that the Ebola virus has originated from  [#permalink]

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New post 09 Mar 2019, 07:50
1
adkikani - I have seen this tag today and some how I did not receive the notification for it. I hope this query has been resolved ? Still I would like to give my view on how to attempt such questions. I always make time line for all the verbs present in the question. On those lines it came down to A and B for me where I selected B. here is the compilation. Hope it helps.

C. has originated from an animal host in a less populated region of Africa and had flourished in areas --- Do we have a past tense verb. We don't so this one can not be the answer.

D. originated from an animal host in a less populated region of Africa and had flourished in areas --- This means first it flourished and then it originated, well can not possible.

E. originated from an animal host in a less populated region of Africa and flourished in areas --- this means 'originated' and 'flourished' happened at same time. highly unlikely.

Between A and B - tell me the event 'originated' is done or not - yes it is done so A can be eliminated. Remember -- simple past is used for the events of the past that have a definite time frame .if time frame is not clear, use present perfect tense.

A. has originated from an animal host in a less populated region of Africa and has flourished in areas

B. originated from an animal host in a less populated region of Africa and has flourished in areas
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Re: Some epidemiologists believe that the Ebola virus has originated from   [#permalink] 09 Mar 2019, 07:50
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