专四语法题Jone often sits in a small bar,drinking and somking con

专四语法题
Jone often sits in a small bar,drinking and somking considerably more （ ）
答案是than is good for his health.
怎么分析?完全摸不着头脑,

Jone often sits in a small bar,drinking and smoking considerably more （ ）
答案是than is good for his health.
怎么分析?完全摸不着头脑,求助高手~
答：楼主应知道,比较状语从句常用略.只不过省略主语的情况较少而已.
省略是为了句子的简洁,条件是不引起歧义,很容易能还原.
此句完整应为：Jone often sits in a small bar,drinking and smoking considerably more than （what ) is good for his health.
省略了主语what= the amount that
题外话,如果话适量饮酒对人健康有一定好处的话,这抽烟我看对人的健康有百害而无一益,不管你适量还是超量.而且对别人的健康有影响.