After years of overwork, my father’s health and he had to retire from business.A. broke o

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A. broke out.
B. broke up.
(答案→)C. broke down.
D. broke off.
解析：句意：多年的过度工作之后,我父亲的身体垮了，不得不从岗位上退休了。
break out (战争,灾难等的)爆发；break up 结束;解散；break down (身体等的)垮掉;(机器的)出故障；break off折断；突然停止，暂停. 根据句意，故选C。