问题补充:
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:
A. that, \
B. who, that
C. who, when
D. that, what
解析: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。