【题目】The judge said that the fine would ________ a warning to other drivers.
A.look intoB.serve asC.watch overD.set up
在线课程【答案】B
【解析】
考查动词短语。句意：法官说，此次罚款将起到对其他司机的警告的作用。A. look into 调查；B. serve as 充当，起……的作用；C. watch over 看管，监视；D. set up 建立。根据“a warning to other drivers.”，可知，罚款只是起警告作用。故选B。