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

A. paid off B. paid back

C. paid for D. paid out

【答案】A

【解析】動詞短語pay off還清，努力得到回報；pay back歸還；pay for付錢…；pay out支付，付出；句意：他們的努力工作已經(jīng)得到了回報。這個計劃終于完成了。根據(jù)句意可知本句中的pay off表示努力得到回報。故A正確。

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