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.

这道ans:A才正确吧??楼主确定答案是d吗??

第一:Until recently惯用;Up until recently无此用法

第二: sheltering做led无伴随动作

第三:, the ice-block domes做同位语表述

综上I support A