He tried to deal with the ever-increasing burden of his work，but finally _____ and had to take a plete rest.A.broke awayB.broke upC.broke downD.broke out
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C解析考查词组辨析：A．broke away 脱离， B．broke up分手，解体， C．broke down（身体）垮掉，机器出故障D．broke out爆发，句意是：他想应付日益增加的工作压力，但最终累垮了，不得不完全休息。选C。