题目内容：

She 'll be ____ next time A more carefully B more careful C careful D the most careful

优质解答

应该选B,A中carefully 是副词,而BE作为系动词只能接形容词,所以A错误.
D中如果说the most careful student 也对.
其实C也勉强正确.只不过不太好,没有任何意义.