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bdumpala
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bdumpala
According to some experts, carbon dioxide is accumulating in the atmosphere so rapidly, largely because of the burning of fossil fuels, that should the present rate of buildup continue, the global concentration of this poison will double by the end of the next century.
(A) that should the present rate of buildup continue, the global concentration of this poison
(B) should the present rate of buildup continue, the global concentration of this poison
(C) should the present rate of buildup be continued, the global concentration of this poison
(D) the global concentration of this poison, were the present rate of buildup continue,
(E) that the global concentration of this poison, if the present rate of buildup did continue,


Please explain your choices

A is the answer. We must select an option with 'that'. E is awkward because of the tense problem (did). Use & placement of 'should' highlights the alarm in the situation.
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Between A and E, because the idiom is so ____ that ____

In E, there's a modifer problem.
(E) that the global concentration of this poison, if the present rate of buildup did continue

What will double by the end of the next century? It is the the global concentration of poison (Choice a) - not the rate as in choice E.

bdumpala
According to some experts, carbon dioxide is accumulating in the atmosphere so rapidly, largely because of the burning of fossil fuels, that should the present rate of buildup continue, the global concentration of this poison will double by the end of the next century.
(A) that should the present rate of buildup continue, the global concentration of this poison
(B) should the present rate of buildup continue, the global concentration of this poison
(C) should the present rate of buildup be continued, the global concentration of this poison
(D) the global concentration of this poison, were the present rate of buildup continue,
(E) that the global concentration of this poison, if the present rate of buildup did continue,


Please explain your choices
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A for subjunctive clause and "so.....that".
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A for me. We need "so...that" and "should", as in the main clause.



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