Ответ:

c. Vitamin E had been oxided before it was used.

Объяснение:

Vitamin E ……….. before it was used.

Выберите один ответ:

a. have been oxidized

b. were oxidized

c. had been oxidized

d. oxidized

Vitamin E had been oxidized before it was used.

Витамин Е был окислен еще до того, как его использовали.