They took a hell of a risk and suffered a great deal but it .
A. paid back
B. paid up
C. paid off
D. paid down
网友回答
A. paid back
B. paid up
(答案→)C. paid off
D. paid down
解析：句意：他们冒了很大的风险,遭了不少罪, 但事情成功了。paid off用作不及物动词短语，意思为“得到好结果；取得成功”。 pay back偿还；pay up全部付清；pay down用现金支付。