题目内容：

She is the only one among us ___knows English A,which B,that C What D,whom

优质解答

根据句意,她是我们之中唯一一个懂得英语的人,本句考查定语从句的用法,根据定语从句的引导词,排除C.____________knows English.是定语从句,修饰先行词the only one,定语从句中缺少主语,排除D,先行词the only one指人,排除A,因而答案为B.