Many people think any government's work should be evaluated on citizens' happiness level．
A. based
B. to be based
C. basing
D. being based
网友回答
(答案→)A. based
B. to be based
C. basing
D. being based
解析：句意：很多人认为任何政府的工作应该以市民的兴奋指数的为基础来评价。这里是方式状语，government's work和base是被动关系，所以用过去分词做状语。所以选A。