大全secton10-14

Inuits 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 Europeans longer than

(B) isolated from contact with Europeans longer than

(C) in isolation from contact with Europeans longer than were

(D) isolated from contact with Europeans longer than were

(E) in isolation and without contacts with Europeans longer than

我知道D选项是对的，那么C错在哪里呢。be isolated from和be in isolation from有什么不一样呢？