Who listens Tom Jack or Bill?A. the most carefulB. the most carefullyC. more carefulD.

问题补充：

Who listens ,Tom, Jack, or Bill?

A. the most careful

B. the most carefully

C. more careful

D. more carefully

答案：

A. the most careful

(答案→)B. the most carefully

C. more careful

D. more carefully

解析：句意：谁听得最认真，是Tom, Jack, 还是 Bill？从句中得知是三个人的比较，所以用最高级。该词是用来修饰动词listen，所以要用副词carefully,故选B。