ron 的解释：
"Up" is redundant, since "until" already carries this meaning.

• The sentence implies that the Inuit are no longer nomads.
If they were still nomads, the sentence wouldn't say "until recently"; it would say "until now" (or some equivalent). Remember that "recently", albeit not too long ago, is still a time in the past.
So, you need the past tense.

请问一下老师，这里的shelter为什么不需要用被动呢？我的理解是需要被igloo遮蔽，所以排除了AB。

不能说during recent times，只能说during five years等。这是因为，during身后需要连接一个独立而确定的时间段（例如five years），而不能连接类似于recent times这样的模糊时间。

during身后需要连接一个独立而确定的时间段（例如five years），而不能连接类似于recent times这样的模糊时间
"Up" is redundant, since "until" already carries this meaning.

• The sentence implies that the Inuit are no longer nomads.
If they were still nomads, the sentence wouldn't say "until recently"; it would say "until now" (or some equivalent). Remember that "recently", albeit not too long ago, is still a time in the past.
So, you need the past tense.

A D只有两句话, 谁主谁从都可以, 错在时态

until recently 应该用过去时， 此外until约等于UP TO， 因此前面基本不加UP

ron 的解释：
"Up" is redundant, since "until" already carries this meaning.

• The sentence implies that the Inuit are no longer nomads.
If they were still nomads, the sentence wouldn't say "until recently"; it would say "until now" (or some equivalent). Remember that "recently", albeit not too long ago, is still a time in the past.
So, you need the past tense.


选项D：本选项具有较高的迷惑性。利用图形背景原则，我们需要对比主句和伴随状语在时间轴上的持续时间。在逻辑上，“Inuit人住在igloos中”这个事件的持续时间肯定长于“Inuit人引领了流浪生活的风潮”的持续时间。这是因为，肯定是Inuit人“先”住在igloos中，然后他们才能引领流浪风潮。因此，shelter应该是从属成分（伴随状语），lead是主句。

选项B：措辞有误，不能说during recent times，只能说during five years等。这是因为，【during身后需要连接一个独立而确定的时间段（例如five years）】，而不能连接类似于recent times这样的模糊时间。另外，主句的谓语动词应该用【过去时】，而不能用lead这个一般现在时。

选项D：本选项具有较高的迷惑性。利用图形背景原则，我们需要对比主句和伴随状语在时间轴上的持续时间。在逻辑上，“Inuit人住在igloos中”这个事件的持续时间肯定长于“Inuit人引领了流浪生活的风潮”的持续时间。这是因为，肯定是Inuit人“先”住在igloos中，然后他们才能引领流浪风潮。因此，shelter应该是从属成分（伴随状语），lead是主句。
ron 的解释：
①"Up" is redundant, since "until" already carries this meaning.
②The sentence implies that the Inuit are no longer nomads.
If they were still nomads, the sentence wouldn't say "until recently"; it would say "until now" (or some equivalent). Remember that "recently", albeit not too long ago, is still a time in the past. So, you need the past tense！

按照语意：主句：'Until recently, the Inuit people led a nomadic existence'
'sheltering in igloos and in structures made of stones, bones, driftwood, and skins.' - Modifying the clause above

另外until = up to

shelter作动词，to protect yourself, or another person or thing, from bad weather, danger, or attack
eg：A group of us were sheltering from the rain under the trees. 被shelter的人是可以用主动语态的

until recently意思是在不久前一个时间点之前，现在不这样了，我觉得had done最好，did也行，但have done肯定不对排除d，do肯定不对排除b
c的in the times that are recent是什么鬼，led和shelter并列需要and
shelter后面的一大段描述nomadic existence，e选项主句变成了描述如何shelter他们住哪，而不是原句的led a nomadic existence

主从句：利用图形背景原则，我们需要对比主句和伴随状语在时间轴上的持续时间。在逻辑上，“Inuit人住在igloos中”这个事件的持续时间肯定长于“Inuit人引领了流浪生活的风潮”的持续时间。这是因为，肯定是Inuit人“先”住在igloos中，然后他们才能引领流浪风潮。因此，shelter应该是从属成分（伴随状语），lead是主句。

ron 的解释：
"Up" is redundant, since "until" already carries this meaning.

• The sentence implies that the Inuit are no longer nomads.
If they were still nomads, the sentence wouldn't say "until recently"; it would say "until now" (or some equivalent). Remember that "recently", albeit not too long ago, is still a time in the past.
So, you need the past tense.

直到最近，某人一直做什么。某人过去一直做某事一直到最近不做了。

D注意语义上的不正确

“Inuit人住在igloos中”这个事件的持续时间肯定长于“Inuit人引领了流浪生活的风潮”的持续时间。这是因为，肯定是Inuit人“先”住在igloos中，然后他们才能引领流浪风潮。因此，shelter应该是从属成分（伴随状语），lead是主句。
而且不是最近才住在igloos中，而是最近才引领风潮。

关键要看句子结构，in...in...，然后排除前面各种关于until recently相关意思的错误用法

until recently
up to recently

因纽特人过着游牧生活，住在冰屋里。
recently指不久前，依然是个过去的时间，用过去时而不是现在完成时。
choice D
PROBLEM: The "up" is unnecessary. The present perfect tense starts in the past and continues into the present. But the use of "until recently" implies that this has stopped, so the present perfect doesn't work.
Remember that "recently", albeit not too long ago, is still a time in the past.

D: up until recently= recently, 不是最近才Shelter，而是最近才引领风潮

而且shelter应该用主动！