【题目】The young man was glad that his experience as a cook in the army finally _______.
A.paid off
B.paid for
C.paid up
D.paid back

【答案】D
【解析】句意：这位年轻人很开心，他在部队作为厨师的经历最终使他取得成功。本题考查动词短语的辨析。pay off成功，带来好结果，得到回报，还清；pay back偿还，还钱；pay up=(全部或按时)付清；缴清(股款等) ；pay for为…支付。根据句意可知选A。