the man was under so much stress that he finally

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答案A． broke down “〔机械)坏了；(计划等)失败；(身体或精神)垮了；(感情控制不住)哭了”
the man was under so much stress that he finally broke down.
他背负着太多的压力以至于最后他身体(承受不了)垮了.
B.broke up “打碎,粉碎；(会议等)终止,结束”
C.broke out“爆发；突然发生；逃脱,逃走”
D.broke in“闯入；插嘴”
======以下答案可供参考======
供参考答案1:
a broke down
崩溃，感情失控
供参考答案2:
c broke out 爆发。
根据句意，承担很大压力。c合适
供参考答案3:
选A　broke down 精神崩溃
这个男人承受如此大的压力，以致于他最终精神崩溃
break up 分手，结束，打碎
break out 爆发，突发
break in 打断，闯入
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供参考答案4:
a broke down
(人）身体出毛病，（健康）衰弱。You/Your health will break down if you work too hard.你工作过度会损害身体
英汉多功能词典
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供参考答案5:
亲， 选A broke down 用于表示 关系破裂，计划失败，神经衰弱
另外 breakdown 连起来 是个名词 ，有崩溃倒塌的意思
1 break down 破除，打破
his marriage broke down
Our car broke down
the teacher broke down the new boy's shyness
2 break up with sb 与某人分手
3 break out 爆发，突然发生war, fighting, or disease breaks out4 break in （通常指盗贼）闯入，破门而入 ；短语动词打断；插嘴The thief had broken in through a first-floor window.小偷是从二楼的窗户进入屋里的。O'Leary broke in on his thoughts 奥利里打断了他的思路。