Bunuel wrote:
In the Champagne region of France, wine growers still harvest grapes as they have done for centuries, by carefully handpicking their crop and storing their precious fruit in specially aged casks.
(A) wine growers still harvest grapes as they have done
(B) the wine grower still harvests grapes as he has
(C) wine growers still harvest grapes as was done
(D) wine growers still harvest grapes as has been done
(E) wine growers still harvest grapes as they did
In the Champagne region of France,
wine growers still harvest grapes as they have done for centuries, by carefully handpicking their crop and storing their precious fruit in specially aged casks.
Concepts tested:-
1) S-V agreement
2) Pronoun
3) Tense
1) wine growers- Subject in plural form. Hence the corresponding verb form must be used. Wine growers----> Harvest
2) Pronoun "they" must refer to corresponding antecedent in plural form. They---->Wine growers
3) Harvesting of grapes started in past and continues till the time of speaking.(Refer the keywords "for centuries" & "Still" ). Hence present perfect must be used. "They have done"
Therefore the original sentence needs zero corrections.
Ans. (A)
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Regards,
PKN
Rise above the storm, you will find the sunshine
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60% (00:59) correct 
