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 existence, sheltered

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

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

答案是A, 可是为什么不用完成时呢?

我因此选了D

D的症结是不是因为,把原句的重心改了?

个人意见：

until ：longman解释：if something happens until a particular time, it continues and then stops at that time

例句：
Until recently, Anna worked as a teacher in Japan.
Up until last year, they didn't even own a car.
这个句子是讲，直到最近之前，Inuit人过的是a nomadic existence的生活，言下之意是，现在不是了。

谓语动词应该用过去时态，因此D不对。

并且，D的意思是：Inuit 过去、现在，一直过着 a nomadic existence 的生活，与句子想表达原意有逻辑错误。

选A

until recently  直到近期    用过去式

recently 不久前到现在

since some time  从过去某个点一直到现在