We know a lot about these early years of European settlement because most migrants with t

问题补充：

We know a lot about these early years of European settlement because most migrants with their families and many of their letters still survive.

A. corresponded

B. related

C. associated

D. combined

答案：

(答案→)A. corresponded

B. related

C. associated

D. combined

解析：考查动词：A. corresponded和…一致，通信B. related和…有关 C. associated联系， D. combined结合，句意：我们了解很多早年的欧洲移民的事情，因为大多数移民和家人通信很多信还在。选A。