The old lady( )on hearing her son's death.
【正确答案】 B
【答案解析】解析:短语辨析。break down禁不住痛哭,(身体、精神)垮了,如:As the funeral service began,David broke down and cried.葬礼开始后,大卫失声痛哭。break in非法闯入;break out爆发。突然发生;break away断绝关系。