Контрольные задания >
8 We... for three hours before we decided to take a break.
A must be trekking
B had been trekking
C have been trekking

Вопрос:
8 We... for three hours before we decided to take a break.
A must be trekking
B had been trekking
C have been trekking
Ответ:
B had been trekking
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