Question

She… for 10 hours before she finished everything.
a. had been working
b. has been working
c. was working

Answer 1

Ответ:

She… for 10 hours before she finished everything.

a. had been working

Объяснение:

Используем Past Perfect Continuous т.к. в предложение есть указание на длительное действие (работала 10 часов), которое закончилось до (before) определенного момента в прошлом (finished everything - всё закончила).