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 AmericaA.that, \B.who, thatC.who, whenD.that, what
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B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。