Question

He does his homework much ________ than he did two years ago.

A. careful
B. more careful
C. carefully
D. more carefully

Answer 1

答案D
空白处处于主句的状语位置，只能修饰谓语动词does，又因为后面的从句由than引导，是比较状语从句，所以应为副词比较级。A和B分别是形容词原级、比较级，应排除。C是副词的原级，也应排除，因此，只有D才是正确答案。