问题补充：
He tried to deal with the ever-increasing burden of his work，but finally and had to take a complete rest.
A. broke away
B. broke up
C. broke down
D. broke out
答案：
A. broke away
B. broke up
(答案→)C. broke down
D. broke out
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。
