Those natives who move from place to place with their animals in the past have moved into new houses at last.
A. could
Bwould
Cmight
D. should
网友回答
A. could
(答案→)B. would
C. might
D. should
解析：这题考查情态动词的用法：would表示“过去常常”，句意是：那些过去带着动物从一个地方到另一个地方的当地人现在已经搬到了新家。选B。