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Re: Studies conducted at Excelmine lab to explore how plasma [#permalink]
My approach was like below:
1. It has to be "have" and not "has"
2. so left with option D and E.
3. Option E doesn't sound good and left with D
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Re: Studies conducted at Excelmine lab to explore how plasma [#permalink]
whether / how : Using "whether" implies we are questioning if plasma particles move in groups or in pairs which changes the original meaning. This eliminates B and E.

has/have : This eliminates A and C

Answer : D
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Re: Studies conducted at Excelmine lab to explore how plasma [#permalink]
shrouded1 wrote:
whether / how : Using "whether" implies we are questioning if plasma particles move in groups or in pairs which changes the original meaning. This eliminates B and E.

has/have : This eliminates A and C

Answer : D



agree with you on "whether/how"
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Re: Studies conducted at Excelmine lab to explore how plasma [#permalink]
This isn't really a "how vs. whether" issue...

A. how plasma particles in groups or in pairs interact with each another, without having to move around one other, has yielded interesting results and attracted the attention

"with each another" and "move around one other" are both completely wrong idioms

B. whether plasma particles in groups or in pairs interact with one another or not, without having to move around each other, have yielded results of interest and attracted the attention

"whether... with one another or not" is redundant

C. how plasma particles in groups or in pairs interact with each another or not, without having to move around one other, has yielded interesting results and have attracted the attention

"with each another" and "around one other" are wrong

D. how plasma particles in groups or in pairs interact with one another, without having to move around each other, have yielded interesting results and attracted the attention

Correct

E. whether plasma particles in groups or in pairs interact with each another, without having to move around one other, have yielded results of interest and have attracted the attention

"with each another" and "around one other" are wrong
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Re: Studies conducted at Excelmine lab to explore how plasma [#permalink]
IMO, how/whether is not the "only" issue, but one of them. geturdream (Has/Have) and TehJay (wrong idiom/redundancy) pointed out other problems. Usually the incorrect options have multiple errors.



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Re: Studies conducted at Excelmine lab to explore how plasma [#permalink]
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