помогите!!!Вопрос 12She ____ for 12 hours before she finished everything.Изберите один

Помогите!!!

Вопрос 12
She ____ for 12 hours before she finished everything.
Изберите 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.
Изберите один ответ:
a. would have been spoiled; didnt forget
b. wouldnt have been spoiled; hadnt forgotten
c. didnt spoil; forgot
d. spoiled; will forget