4. I assured the boss that all the letters partners would receive them the next day. a) are being answered b) were being answered

4. I assured the boss that all the letters partners would receive them the next day.

a) are being answered

b) were being answered

and put in the envelopes. Our

c) have been answered

d) had been answered

Действие (отправка писем) произошло в прошлом, и письма были в процессе получения ответа.

Ответ: b) were being answered