prep1-50 (没办法一个人在北美学习，不懂只好求助各位了，拜托了）

简禾

十楼的问题我也想知道

lijiahui0422

两者皆可吧

mia113

比较中若句子主语太长通常加倒装的系动词或组动词避免指代不清
those (that..)定于从句修饰主语  太长了 所以用了倒装
大家可以参考
Innits of the Bering Sea were in isolation from contact with Europeans longer than Aleuts or Inuits of the North Pacific and northern Alaska.
（A） in isolation from contact with Eurpoeans longer than
（B） isolated from contact with Eurpoeans longer than
（C）in isolation from contact with Eurpoeans longer than were
（D） isolated from contact with Eurpoeans longer than were （D）
（E） in isolation and without contact with Eurpoeans longer than

miho520

up~感谢楼上的解释~

家辉的毛小毛

考的平行结构啊，than是连词，前后形式，结构一致，所以选A