On hearing the news that her son had won the game she laughter.A. burst outB. burst into

问题补充：

On hearing the news that her son had won the game, she laughter.

A. burst out

B. burst into

C. burst with

D. burst upon

答案：

A. burst out

(答案→)B. burst into

C. burst with

D. burst upon

解析：考察固定结构。Burst into laughter=burst out laughing突然笑起来。结合句意可知B正确。句意：一听见她儿子赢得比赛的消息，她突然就笑起来了。