54.Greatly influenced by the Protestant 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 nations of the Iroquois League sided
(D) were the only ones out of the five nations of the Iroquois League in siding
(E) only of the five-nation Iroquois League had sided
答案C,为什么不能选A呢?难道是A中的who不对?
C中alone前面没有be动词啊
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