Old people really enjoy the speed ____their messages get sent and answered after learning how to use...
2022-06-08 19:16:09 192次 2020届江苏省盐城市高三第三次模拟英语试卷 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
Old people really enjoy the speed ____their messages get sent and answered after learning how to use WeChat.
A.that B.where C.at which D.in which
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