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# There is substantial evidence that certain forms of solar

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There is substantial evidence that certain forms of solar [#permalink]

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03 Jan 2006, 17:30
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There is substantial evidence that certain forms of solar energy either now or within a few years will be economically competitive with conventional sources of heat and power.
(A) either now or within a few years will be economically competitive with conventional sources of heat and power
(B) will either be economically competitive with conventional sources of heat and power within a few years or are so now
(C) will be economically competitive with conventional sources of heat and power either now or within a few years
(D) either are now economically competitive with conventional sources of heat and power or will be so within a few years
(E) are either now or will be within a few years economically competitive with conventional sources of heat and power
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03 Jan 2006, 21:26
I am thinking D

isnt 'are' necessary in the either clause?
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04 Jan 2006, 17:23
I thinking "C" but not exactly clear on why A is wrong.
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04 Jan 2006, 19:06
I am going to go with C.

Basically the sentence is trying to compare solar energy with conventional energy and say that solar enery will be competitive today or in the future. I think only C makes the comparision clear.

In A, "either now or within a few years" intereferes between the comparision of the two forms of energy.
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04 Jan 2006, 20:33
Since they already have the evidence, doesnt' this indicate that it's already happening? Hence: "..are now...or will be"

My vote for E
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04 Jan 2006, 22:07
I think it is 'D', best of the rest. All other choices have problems.
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04 Jan 2006, 23:00
My vote for E....but not too sure. Please explain the OA
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05 Jan 2006, 07:28
gmacvik wrote:
There is substantial evidence that certain forms of solar energy either now or within a few years will be economically competitive with conventional sources of heat and power.
(A) either now or within a few years will be economically competitive with conventional sources of heat and power
(B) will either be economically competitive with conventional sources of heat and power within a few years or are so now
(C) will be economically competitive with conventional sources of heat and power either now or within a few years
(D) either are now economically competitive with conventional sources of heat and power or will be so within a few years
(E) are either now or will be within a few years economically competitive with conventional sources of heat and power

D all the way

A B and C are out for sure because it's saying will be either now or later

will be has to be later, will be can't be now, it's not logical. D and E is a tough call but D is better for me. whoever got this question, what's the official answer?
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05 Jan 2006, 22:57
D it is.

2) present verb tense is required for present events.
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06 Jan 2006, 05:01
It is between D and E, whereas I think D is more concise.
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06 Jan 2006, 13:40
OA is D, rlevochkin explaination looks reasonable to me, thanks for explaining, but A also falls in the same rule, don't you think?
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07 Jan 2006, 06:11
gmacvik wrote:
OA is D, rlevochkin explaination looks reasonable to me, thanks for explaining, but A also falls in the same rule, don't you think?

No. 'A' fails by saying, "now will be"
Only 'D' keeps the tense & either-or condition!
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