The house is finished at last. All their hard work has .A. paid backB. paid upC. paid offD

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A. paid back
B. paid up
(答案→)C. paid off
D. paid for
解析：这题考查词组辨析：paid back报答，偿还，paid up全部还清，付清
paid off （努力）有回报，成功， paid for为…付钱，根据句意：这个房子最后完成了，所有的努力都没白费。选C。