问题补充:
Who sings of the three?
A. most beautiful
B. most beautifully
C. more beautiful
D. more beautifully
答案:
A. most beautiful
(答案→)B. most beautifully
C. more beautiful
D. more beautifully
解析:句意:这三个人当中,谁唱得最好?结合语境可知本句中表示在多个中进行对比,本句中修饰词修饰动词sing,做状语,故用副词的最高级,选B。