单选题 Tony's salary as a plumber is much higher than ______.
A. a teacher B. a teacher has
C. that of a teacher does D. that of a teacher

【正确答案】 D
【答案解析】[考点] 指示代词用法
[解析] 注意代词that指代的是工资(the salary)，是比较的对象。故正确答案为D项。