问题补充：
How beautifully she sings! I have never heard＿＿＿.
A. the better voice
B. a good voice
C. the best voice
D. a better voice
答案：
A. the better voice
B. a good voice
C. the best voice
(答案→)D. a better voice
解析：这是用比较级表达最高级含义的常用句型。它相当于Her voice is the best one that I have ever heard.
