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Bunuel
At a time when many English farmers had been virtually bankrupted by certain epidemics they were further required to have destroyed animals with mad cow disease or foot and mouth disease.


(A) to have destroyed animals with mad cow disease or foot and mouth disease

(B) to have had destroyed animals with mad cow disease or foot and mouth disease

(C) either to have had destroyed animals with mad cow disease or foot and mouth disease

(D) to destroy animals with either mad cow disease or foot and mouth disease

(E) either to destroy animals with mad cow disease or foot and mouth disease


+1 for D

(A) to have destroyed animals with mad cow disease or foot and mouth disease -->awkward verb tense to have destroyed, no need of present perfect tense here. Simple tense is best way
(B) to have had destroyed animals with mad cow disease or foot and mouth disease --> this is one step furtherand sounds even worse
(C) either to have had destroyed animals with mad cow disease or foot and mouth disease --> same mistake as in B, futher parallelism is not maintained
(D) to destroy animals with either mad cow disease or foot and mouth disease --> simple present tense is used and also, parallelism is maintained
(E) either to destroy animals with mad cow disease or foot and mouth disease[/quote] --> parallelism error
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IMO answer is D.

Bunuel
At a time when many English farmers had been virtually bankrupted by certain epidemics they were further required to have destroyed animals with mad cow disease or foot and mouth disease.


Quote:
(A) to have destroyed animals with mad cow disease or foot and mouth disease
the "have" has no function here.

Quote:
(B) to have had destroyed animals with mad cow disease or foot and mouth disease
to have had is incorrect. "At a time when english farmers had been X they were required to do verb" .

Quote:
(C) either to have had destroyed animals with mad cow disease or foot and mouth disease
either to have had is incorrect. Either X or Y parallelism is wrong.

Quote:
(D) to destroy animals with either mad cow disease or foot and mouth disease
required to destroy animals with either [color=#438cca]X or Y. This is the correct option. [/color]

Quote:
(E) either to destroy animals with mad cow disease or foot and mouth disease
Incorrect Either X or Y parallelism. [/quote]
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Bunuel
At a time when many English farmers had been virtually bankrupted by certain epidemics they were further required to have destroyed animals with mad cow disease or foot and mouth disease.


(A) to have destroyed animals with mad cow disease or foot and mouth disease

(B) to have had destroyed animals with mad cow disease or foot and mouth disease

(C) either to have had destroyed animals with mad cow disease or foot and mouth disease

(D) to destroy animals with either mad cow disease or foot and mouth disease

(E) either to destroy animals with mad cow disease or foot and mouth disease

MANHATTAN REVIEW OFFICIAL EXPLANATION:



The correct expression is that the farmers were required to do something, not to have done something nor to have had done something. Eliminate A, B and C. ‘Either’ in E is incorrect. As E is written it implies the farmers were required to do one of two things: either destroy animals with mad cow disease or perform a second action. The second action is missing. Choice D is the correct answer.
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