单选题 He drives much ______ than he did three years ago.
A. more carefullyB. carefully C. more careful

【正确答案】 A
【答案解析】[解析] 句中有than，可知此句中所涉及的是比较级的知识，首先可以排除B；同时本句中的谓语是实义动词，应该用副词来修饰。