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