Until recently, the Inuit people led a nomadic existence, sheltering in igloos, the ice-block domes that are peculiar to north-central Canada, and in structures made of stones, bones, driftwood, and skins. A. Until recently, the Inuit people led a nomadic existence, sheltering B. During recent times, the Inuit people lead a nomadic existence, sheltering. C. In the times that are recent, the Inuit people led a nomadic exis- tence, sheltered. D. Up until recently, the Inuit people, leading a nomadic exis- tence, have sheltered. E. Until recent times, leading a nomadic existence, the Inuit people were sheltered.
Both 'Until recently' and 'Up until recently' are grammatically correct. I've got an example fro Cambridge Dictionary:
'Until very recently he worked as a teacher and he still shudders at the memories.'
The tense is same as that of A. Could some experts help to clarify? Thanks. | 
