Question

【题目】All their hard work has !The project is finished at last.

A. paid off B. paid back

C. paid for D. paid out

Answer 1

【答案】A

【解析】动词短语pay off还清，努力得到回报；pay back归还；pay for付钱…；pay out支付，付出；句意：他们的努力工作已经得到了回报。这个计划终于完成了。根据句意可知本句中的pay off表示努力得到回报。故A正确。