(2017·北京)Many airlines now allow passengers to print their boarding passes online ________ their val...
2022-09-14 04:09:03 83次 北京市2018-2019学年高二上学期期中考试英语试卷 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
(2017·北京)Many airlines now allow passengers to print their boarding passes online ________ their valuable time.
A. save B. saving
C. to save D. saved
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