54. Greatly influenced by the Protested missionary Samuel Kirkland, the Oneida was the only one of the five-nation Iroquois League who sided with the colonists during the American Revolution.
A. was the only one of the five-nation Iroquois League who sided
B. was alone of the five-nation Iroquois League when they sided
C. alone among the five-nation Iroquois League sided
D. were the only ones out of the five nations of Iroquois League in siding
E. only of the five-nation Iroquois League had sided
答案是C
我想請問
only one 和 alone 有什麼用法上的不同嗎?