Choose grammatically correct variant(выбрать грамматически ПРАВИЛЬНЫЙ ответ) a) Don't you know if you post a letter of complaint they would respond in time? b) Don't you know if you've posted a letter of complaint they will respond in time? c) Don't you know if you post a letter of complaint they will respond in time?
c) Don't you know if you post a letter of complaint they will respond in time?