помогите!!!

Вопрос 12
She ____ for 12 hours before she finished everything.
Выберите один ответ:
a. has been working
b. is working
c. has worked
d. had been working
Вопрос 13
The dinner ________ if you ________ the dish in the oven.
Выберите один ответ:
a. would have been spoiled; didn’t forget
b. wouldn’t have been spoiled; hadn’t forgotten
c. didn’t spoil; forgot
d. spoiled; will forget