问题
选择题
Americans _________sent a message to the world________ we have never been a collection of Red States and Blue States: we are, and always will be, the United States of America.
A．that, \
B．who, that
C．who, when
D．that, what
答案
答案：B
本题考查定语从句及名词性从句。第一空先行词Americans，在定语从句中作主语，故用关系词who，第二空that引导同位语从句，解释说明名词message，故选B。