He drives much _______ than he did ten years ago.
【正确答案】 C
【答案解析】本题考查副词比较级。这里需要一个副词来修饰动词drive,careful是形容词,carefully是副词,所以先排除B;than要求用比较级,所以排除A,选C。carefully的比较级是在前面加more.