问题补充：
The police found the lost car .
A. by mistake
B. by accident
C. with mistake
D. in accident
答案：
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。
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