Her health under the pressure of work and she had to stay in hospital for a month.A. broke

问题补充：

Her health under the pressure of work and she had to stay in hospital for a month.

A. broke up

B. broke down

C. broke out

D. broke away

答案：

A. broke up

(答案→)B. broke down

C. broke out

D. broke away

解析：词义辨析。broke up分手，结束，打碎；broke down发生故障，身体垮掉；broke out战争，火灾的突然爆发；broke away摆脱，脱离。句意：她的健康在工作压力下垮掉了，她不得不在医院住一个月。所以选B。