Lucy is one of in her class.A. the good studentB. the better studentC. the best studentD.

问题补充：

Lucy is one of in her class.

A. the good student

B. the better student

C. the best student

D. the best students

答案：

A. the good student

B. the better student

C. the best student

(答案→)D. the best students

解析：联系上下文，可知本句表示在多个中进行对比，故用形容词的最高级。句意：露西是她的班内最好的学生之一。结合语境可知student应用复数形式，故选D。