问题描述：
[单选]
2018-2019学年吉林高一下学期期末第73题1分（）the convenience of digital payment， many senior citizens started to use smartphones．
A．To enjoy
B．Enjoying
C．C To have enjoyed
D．Enjoy
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答案解析：无
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上一篇：2015-2016学年北京朝阳区高二上学期期末第23融1分A person（）up early in the morning for work usually has a better chance to succeed
下一篇：2020~2021学年广东深圳福田区深圳市高级中学高中部高一下学期期中第83题1分China"s image is improving steadily， with more countries（）ts role in internationalaffairs．
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