hilanjingling

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。