—What do you think of Liu Huan?—Oh he is my favourite singer. I think no one can sing.A.

问题补充：

—What do you think of Liu Huan?

—Oh, he is my favourite singer. I think no one can sing.

A. good

B. well

C. better

D. best

答案：

A. good

B. well

(答案→)C. better

D. best

解析：副词比较级的用法。sing为行为动词，故用副词well修饰，I think no one can sing后省略了than he，故要用well的比较级better。