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. bined
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(答案→)A. corresponded
B. related
C. associated
D. bined
解析：考查动词：A. corresponded和…一致，通信B. related和…有关 C. associated联系， D. bined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。