单选题 David often sits in a small bar, drinking and smoking considerably more ______.

A、 than that he is healthy
B、 than good for His health
C、 than his health could
D、 than is good for his health

【正确答案】 D

【答案解析】[解析] 本题中，than是关系代词，引导定语从句。than作关系代词时，一般用在形式为比较级的复合句中，其结构为形容词比较级(more)...than+从句，than在从句中作主语，相当于that，代表它前面的先行词。例如：This advertisement is more affective than is expected.