Wine growers

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