Most students think Lady Gaga is one of singers in USA now.A. popularB. more popularC. mo

问题补充：

Most students think Lady Gaga is one of singers in USA now.

A. popular

B. more popular

C. most popular

D. the most popular

答案：

A. popular

B. more popular

C. most popular

(答案→)D. the most popular

解析：形容词副词的比较级多用于两个事物进行对比，三个及三个以上事物进行对比时用最高级。One of the后接形容词最高级表示最……之一，因此选D，最流行的歌手之一。