until recently的用法

zxclx3

Until recently, the Inuit people leda nomadic existence, sheltering inigloos, theice-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 nomadicexistence, sheltering

C.   In the times that are recent, the Inuit people led anomadic existence, sheltered

D.   Up until recently, the Inuit people, leading a nomadicexistence, have sheltered

E.    Until recent times, leading a nomadic existence, the Inuitpeople were sheltered

这个题答案是A还是B，我看的答案是A。但是这个05年的帖子写答案是B。until recently是不是一定要加一般过去式啊？
http://forum.chasedream.com/foru ... ht=until%2Brecently