Bless your heart, I know you didn't break the vase . Don't cry!
A. on purpose
B. by accident
C. on business
D. by mistake
网友回答
(答案→)A. on purpose
B. by accident
C. on business
D. by mistake
解析：句意：好了好了，我知道你不是故意打破花瓶的。别哭了！B.偶然；C.出差；D.错误地。故选A（故意地。）
考点: 考查介词短语的用法。