—How did you manage to get such a nice old painting?
—Quite .
A. by accidents
B. by a chance
C. by accident
D. by incident
网友回答
A. by accidents
B. by a chance
(答案→)C. by accident
D. by incident
解析：考查固定短语：偶然地，无意地by accident = by chance，句意：你是怎么成功的得到了如此好的古老的一幅油画。非常偶然。所以选C。