Some people get in touch with each other by mobile phones__________ others keep contact with each ot...
2022-10-27 05:38:56 15次 2016届湖南衡阳八中高一下学期期末考试英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
Some people get in touch with each other by mobile phones__________ others keep contact with each other by e-mail.
A. when B. before C. while D. since
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