For many years we have been keeping in by sending each other e-mails or phone calls.
A. connection
B. contrast
C. relation
D. touch
网友回答
A. connection
B. contrast
C. relation
(答案→)D. touch
解析：本题的含义为数年来我们通过发电子邮件或打电话保持着联系，keep in touch with表示保持联系的含义，故本题选D。