He devoted most of his time to research, believing his hard work would ________ sooner or later．
A.put off
B.take off
C.turn off
D.pay off
网友回答
D解析本句意为“他投入了大量的时间做研究，他相信他的努力迟早会得到回报的”。put off意为“推迟”；take off意为“脱掉(衣服)，(飞机)起飞”；turn off意为“关掉(电视、电灯)”；pay off意为“成功、带来好结果”。