The police found the lost car .A. by mistakeB. by accidentC. with mistakeD. in accident

网友回答

A. by mistake
(答案→)B. by accident
C. with mistake
D. in accident
解析：根据题干，本句的意思是“警察偶然发现了这辆丢失的车。”“偶然”是by accident。而by mistake是“错误地”。所以本题选B。