He drives much ________than he did three years ago.

题目

He drives much ________than he did three years ago.
a.careful b.carefully c.more careful d.more carefully
该选哪个?为什么

答案

D
首先是比较级.
其次,行为动词后应为副词,所以选carefully,不用careful.
最后,carefully是多音节单词,比较级在前面加more.