Which of the following words was used during the American Civil War to refer to those northerners who were secretly aiding the South?（ ）
A.Rattlesnake B.Villain C.Informer D.Copperhead正确答案D
Which of the following words was used during the American Civil War to refer to those northerners who were secretly aiding the South?（ ）
A.Rattlesnake B.Villain C.Informer D.Copperhead正确答案D
