Now Tom studies _____than he did before A more careful B more carefully

Now Tom studies _____than he did before A more careful B more carefully
Now Tom studies _____than he did before A more careful B more carefully

Now Tom studies _____than he did before A more careful B more carefully
B
用副词 carefully 去修饰动词studies
翻译：现在汤姆比以前学习仔细多了.
不明白的再问哟,请及时采纳,多谢!

B

【B】carefull 是副词修饰动词，studies是动词

B副词修饰动词

B
因为副词形容动词study，

B more carefully
more是可以修饰比较级的副词。副词既可以修饰形容词也可以修饰副词。具体应用什么要视谓语动词来定。如果谓语动词是实意动词就要用副词carefully来修饰，如谓语是半系动词或be动词则用careful来修饰。